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List of works by Stephan Geier

2M0415+0154: a new bright, short-period subdwarf B pulsator

scientific article published in January 2009

A Gaia Data Release 2 catalogue of white dwarfs and a comparison with SDSS

scholarly article

A luminous stellar outburst during a long-lasting eruptive phase first, and then SN IIn 2018cnf

scientific article published in August 2019

A new bright eclipsing hot subdwarf binary from the ASAS and SuperWASP surveys

scientific article

A planet in a polar orbit of 1.4 solar-mass star

A progenitor binary and an ejected mass donor remnant of faint type Ia supernovae

scientific article published in Astronomy and Astrophysics

A proto-helium white dwarf stripped by a substellar companion via common-envelope ejection. Uncovering the true nature of a candidate hypervelocity B-type star

scientific article published in June 2021

A quantitative in-depth analysis of the prototype sdB+BD system SDSS J08205+0008 revisited in the <i>Gaia</i> era

scientific article published on 23 November 2020

A quasar hiding behind two dusty absorbers. Quantifying the selection bias of metal-rich, damped Ly{alpha} absorption systems

scientific article published in January 2018

A stripped helium star in the potential black hole binary LB-1 ⬇️

journal article from 'Astronomy & Astrophysics' published in 2020

An ancient F-type subdwarf from the halo crossing the Galactic plane ⬇️

scientific article published in January 2015

An extremely fast halo hot subdwarf star in a wide binary system ⬇️

An in-depth reanalysis of the alleged type Ia supernova progenitor Henize 2−428

scholarly article

Analysis of Two Eclipsing Hot Subdwarf Binaries with a Low Mass Stellar and a Brown Dwarf Companion

Analysis of Two Eclipsing Hot Subdwarf Binaries with a Low Mass Stellar and a Brown Dwarf Companion

Analysis of two eclipsing hot subdwarf binaries with a low mass stellar and a brown dwarf companion

article published in 2010

Asteroids’ physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution

scientific article (publication date: 22 February 2013)

Binaries discovered by the MUCHFUSS project. FBS 0117+396 : An sdB+dM binary with a pulsating primary

scholarly article

Binaries discovered by the MUCHFUSS project. SDSS J162256.66+473051.1: An eclipsing subdwarf B binary with a brown dwarf companion ⬇️

scientific article published in Astronomy and Astrophysics

Binaries discovered by the MUCHFUSS project: SDSS J08205+0008--An eclipsing subdwarf B binary with a brown dwarf companion ⬇️

scientific article

Binaries discovered by the SPY project

scientific article published in Astronomy and Astrophysics

Binaries discovered by the SPY survey. VI. Discovery of a low mass companion to the hot subluminous planetary nebula central star EGB 5 - a recently ejected common envelope?

scientific article published in January 2011

Binary sdB stars with massive compact companions

scientific article published in January 2008

Candidate hypervelocity stars of spectral type G and K revisited ⬇️

scientific article published in January 2015

Characterization of the near‐interface region of chemical vapor deposited diamond films on silicon by backscatter Kikuchi diffraction

scientific article published on 3 October 1994

Confirming new white dwarf-ultracool dwarf binary candidates

scientific article

Constraints on the winds of hot subdwarf stars from X-ray observations of two sdB binaries with compact companions: CD -30 11223 and PG 1232-136 ⬇️

scientific article

Cosmic ray origin in OB associations and preferential acceleration of refractory elements: evidence from abundances of Elements_26_ Fe through_34_Se ⬇️

scientific article published in January 2009

Determining the fraction of reddened quasars in COSMOS with multiple selection techniques from X-ray to radio wavelengths ⬇️

scientific article published in Astronomy and Astrophysics

Discovery of a close substellar companion to the hot subdwarf star HD 149382--The decisive influence of substellar objects on late stellar evolution ⬇️

scientific article published in the Astrophysical Journal

Discovery of a highly magnetic He-sdO star from a double-degenerate binary merger

scientific article published in February 2022

Discovery of a stripped red giant core in a bright eclipsing binary system

scientific article

Discovery of hot subdwarfs covered with helium-burning ash

scientific article published on 11 February 2022

Discovery of radial velocity variable post-AGB stars from the MUCHFUSS project

Discovery of the broad-lined type IC SN 2013cq associated with the very energetic GRB 130427A ⬇️

scientific article published in the Astrophysical Journal

Discovery of two bright DO-type white dwarfs

scholarly article

EC 10246-2707: an eclipsing subdwarf B + M dwarf binary

scientific article published in January 2013

EL CVn-type binaries - discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems

article by P. F. L. Maxted et al published 20 November 2013 in Monthly Notices of the Royal Astronomical Society

EVR-CB-001: An Evolving, Progenitor, White Dwarf Compact Binary Discovered with the Evryscope

Extinction curve template for intrinsically reddened quasars ⬇️

scientific article published in Astronomy and Astrophysics

Forbidden hugs in pandemic times. IV. Panchromatic evolution of three luminous red novae

scientific article published in March 2023

GRB 120422A/SN 2012bz: Bridging the gap between low- and high-luminosity gamma-ray bursts ⬇️

scientific article published in Astronomy and Astrophysics

GRB 120422A: i-band re-brightening and possible SN detection

scholarly article

GRB 120422A: i-band re-brightening and possible SN detection

scientific article published in January 2012

GRB 120630A: NOT optical source within the XRT error circle

scientific article published in January 2012

GRB 120805A: optical afterglow confirmation from the NOT

GRB 120819A: afterglow candidate from NOT

scientific article published in January 2012

GRB 130603B: afterglow detection from NOT

scientific article published in January 2013

GRB 130702A: NOT optical observations

GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy

GRB 140423A: NOT Afterglow Observations

scholarly article

GRB 140903A: NOT optical and NIR observations

GRB 150314A: NOT optical observations

scientific article published in January 2015

GRB 160104A: Spectroscopic observations from 10.4m GTC

scientific article published in January 2016

GRB 160119A: NOT and GTC afterglow candidate

scholarly article

GRB 160121A: redshift from the 10.4m GTC

scholarly article

GRB 160623A: afterglow spectroscopy by GTC and independent redshift determination

GRB 161219B/SN 2016jca: A low-redshift gamma-ray burst supernova powered by radioactive heating

scientific article published in Astronomy and Astrophysics

GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC

scientific article published in January 2016

GRB 170428A: GTC spectroscopic redshift of candidate host galaxy

scientific article

GRB 170604A: GTC spectroscopic redshift

scholarly article

GRB130702A: NOT observation - the detection of an emerging supernova

scientific article published in January 2013

Hot subdwarf binaries from the MUCHFUSS project ⬇️

scientific article published in Astronomy and Astrophysics

Hot subdwarf binaries – Masses and nature of their heavy compact companions

Hot subdwarf stars and their connection to thermonuclear supernovae ⬇️

Hot subdwarf stars in close-up view. I. Rotational properties of subdwarf B stars in close binary systems and nature of their unseen companions

scientific article published in Astronomy and Astrophysics

Hot subdwarf stars in close-up view. II. Rotational properties of single and wide binary subdwarf B stars

scientific article published in January 2012

Hot subdwarf stars in close-up view. III. Metal abundances of subdwarf B stars

scientific article

Hot subdwarf stars in close-up view. IV. Helium abundances and the ^3^He isotopic anomaly of subdwarf B stars

scientific article

Hot subdwarf stars in the Galactic halo Tracers of prominent events in late stellar evolution ⬇️

Hot subdwarfs in binary systems and the nature of their unseen companions

KIC 7668647: a 14 day beaming sdB+WD binary with a pulsating subdwarf ⬇️

scientific article published in Astronomy and Astrophysics

Kepler-423b: a half-Jupiter mass planet transiting a very old solar-like star ⬇️

scientific article published in Astronomy and Astrophysics

LIGO/Virgo S190426c: Gaia19boq 0.6m BOOTES-5/JGT, 1.5m OSN and 10.4m GTC observations

LIGO/Virgo S190426c: ZTF19aaslzjf, ZTF19aasmftm and ZTF19aasmddt 1.5m OSN and 10.4m GTC observations

scholarly article

Looking into the cradle of the grave: J22564–5910, a potential young post-merger hot subdwarf

scientific article published in November 2021

M 31 nova candidate

MUCHFUSS - Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS

scholarly article

Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS)—Status report

Massive unseen companions to hot faint underluminous stars from SDSS (MUCHFUSS)

scientific article published in Astronomy and Astrophysics

Measurement of the abundance of radioactive ^10^Be and other light isotopes in cosmic radiation up to 2 GeV/Nucleon with the balloon-borne instrument ISOMAX ⬇️

scientific article published in January 2004

Metal abundances of subdwarf B stars from SPY - a pattern emerges

scientific article published in January 2008

Mode identification based on time-series spectrophotometry for the bright rapid sdB pulsator EC 01541-1409

scientific article

Multi-object spectroscopy of stars in the CoRoT fields. I. Early-type stars in the CoRoT-fields IRa01, LRa01, LRa02

scientific article published in Astronomy and Astrophysics

Multiband photometry and spectroscopy of an all-sky sample of bright white dwarfs

scientific article published in January 2017

Mysterious, variable, and extremely hot: White dwarfs showing ultra-high excitation lines

scientific article published in March 2021

NIR monitoring of M31LRN2015

scientific article published in January 2015

NIR photometry of M31LRN 2015

scientific article published in January 2015

News From The Erebos Project

Non-local thermodynamic equilibrium spectral analysis of five hot, hydrogen-deficient pre-white dwarfs

scientific article published in February 2022

OT 110215: NIR observations from NOT of GRB candidate

scientific article published in January 2011

OT 110215: further NIR observations from NOT of the GRB candidate

Observations of the SN impostor in NGC 2770 from the 10.4 m GTC

On the Progenitor and Nature of ASASSN-18gq

Optical spectroscopy of candidate Alpha Persei white dwarfs

scientific article published in January 2015

Optical/Near-infrared selection of red quasi-stellar objects: evidence for steep extinction curves toward galactic centers?

article

Orbital solutions of eight close sdB binaries and constraints on the nature of the unseen companions ⬇️

scientific article published in Astronomy and Astrophysics

PTF1 J082340.04+081936.5: a hot subdwarf B star with a low-mass white dwarf companion in an 87-minute orbit ⬇️

scientific article published in the Astrophysical Journal

Phase-resolved spectroscopy andKeplerphotometry of the ultracompact AM CVn binary SDSS J190817.07+394036.4 ⬇️

scientific article

Photometric survey, modelling, and scaling of long-period and low-amplitude asteroids

scientific article

Probable M31 Stellar Merger - NOT ALFOSC I-band Photometry

Probable M31 Stellar Merger - NOT ALFOSC Photometry

Public Surveys at ESO

Quantitative spectral analysis of the sdB star HD 188112: A helium-core white dwarf progenitor ⬇️

scientific article published in January 2016

Radial Velocity Search for Substellar Companions to sdB Stars

Radial velocity variable, hot post-AGB stars from the MUCHFUSS project. Classification, atmospheric parameters, formation scenarios ⬇️

scientific article published in Astronomy and Astrophysics

Revealing the True Nature of Hen 2-428

scientific article published on 14 August 2018

SHOTGLAS. I. The ultimate spectroscopic census of extreme horizontal branch stars in {omega} Centauri

scientific article published in January 2018

SNhunt151: an explosive event inside a dense cocoon

scholarly article

Selecting asteroids for a targeted spectroscopic survey ⬇️

scientific article published in January 2014

Serendipitous discovery of a projected pair of QSOs separated by 4.5 arcsec on the sky ⬇️

scientific article published in Astronomical Journal

Space Telescope and Optical Reverberation Mapping Project. IX. Velocity–Delay Maps for Broad Emission Lines in NGC 5548

scientific article published in 2021

Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-line Analysis for NGC 5548 ⬇️

scientific article published in the Astrophysical Journal

Space Telescope and Optical Reverberation Mapping Project. VII. Understanding the Ultraviolet Anomaly in NGC 5548 with X-Ray Spectroscopy

scientific article published in the Astrophysical Journal

Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

scholarly article

Space Telescope and Optical Reverberation Mapping Project. XII. Broad-line Region Modeling of NGC 5548

scientific article published in 2020

Space Telescope and optical reverberation mapping project. VI. Reverberating disk models for NGC 5548 ⬇️

scientific article published in the Astrophysical Journal

Space telescope and optical reverberation mapping project. III. Optical continuum emission and broadband time delays in NGC 5548 ⬇️

scientific article published in the Astrophysical Journal

Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 ⬇️

scientific article published in the Astrophysical Journal

Spectral analysis of the binary nucleus of the planetary nebula Hen 2-428 – first results

scholarly article

Spectroscopic analysis of sdB binaries from the SPY project

Spectroscopic classification of SN 2019klk as a type IIP supernova with LT + SPRAT and GTC + OSIRIS

scientific article published in January 2019

Spectroscopic twin to the hypervelocity sdO star US 708 and three fast sdB stars from the Hyper-MUCHFUSS project

scientific article published in Astronomy and Astrophysics

Stellar dynamics. The fastest unbound star in our Galaxy ejected by a thermonuclear supernova ⬇️

scientific article

Study of the Growth of Thin Expitaxial CVD Diamond Films on Silicon

scientific article published in July 1996

Sub-stellar companions of intermediate-mass stars with CoRoT: CoRoT–34b, CoRoT–35b, and CoRoT–36b

scientific article published in August 2022

Substellar Companions and the Formation of Hot Subdwarf Stars

Sudden NIR brightening of the Andromeda galaxy Red Nova M31LRN 2015

scientific article published in January 2015

Super-luminous type IC supernovae: catching a magnetar by the tail ⬇️

scientific article published in the Astrophysical Journal

Supernova 2011fc = PSN J23013638+3220069

Supernova 2012bv in NGC 6796 = PSN J19213020+6108101

Supernovae 2016bdu and 2005gl, and their link with SN 2009ip-like transients: another piece of the puzzle

article by A. Pastorello et al published 13 October 2017 in Monthly Notices of the Royal Astronomical Society

THE HIGHAVQuasar Survey: Reddened Quasi-Stellar Objects selected from optical/near-infrared photometry. II ⬇️

The High AV Quasar Survey: A z = 2.027 metal-rich damped Lyman-α absorber towards a red quasar at z = 3.21

scientific article published in Astronomy and Astrophysics

The Hyper-MUCHFUSS project: probing the Galactic halo with sdB stars

scientific article published in January 2011

The January 2015 outburst of a red nova in M 31 ⬇️

scientific article published in Astronomy and Astrophysics

The Low-Energy Telescope (LET) and SEP Central Electronics for the STEREO Mission

The MUCHFUSS Project—Searching for Massive Compact Companions to Hot Subdwarf Stars

article published in 2010

The MUCHFUSS photometric campaign

scientific article

The MUCHFUSS project - searching for hot subdwarf binaries with massive unseen companions. Survey, target selection and atmospheric parameters

scientific article published in January 2011

The Moon Mineralogy Mapper (M3) imaging spectrometer for lunar science: Instrument description, calibration, on-orbit measurements, science data calibration and on-orbit validation

scholarly article

The OmegaWhite Survey for Short-period Variable Stars. V. Discovery of an Ultracompact Hot Subdwarf Binary with a Compact Companion in a 44-minute Orbit

scientific article published in the Astrophysical Journal

The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project ⬇️

scientific article published in Astronomy and Astrophysics

The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project (Corrigendum)

scientific article published in Astronomy and Astrophysics

The enigmatic He-sdB pulsator LS IV-14{deg}116: new insights from the VLT ⬇️

scientific article published in January 2015

The evolution of luminous red nova AT 2017jfs in NGC 4470

scientific article

The extended High A(V) Quasar survey: searching for dusty absorbers toward mid-infrared-selected quasars ⬇️

scientific article published in the Astrophysical Journal

The fast-rotating, low-gravity subdwarf B star EC 22081-1916: remnant of a common envelope merger event ⬇️

scholarly article

The helium-rich subdwarf CPD-20{deg}1123: a post-common-envelope binary evolving on to the extended horizontal branch

scientific article

The hot subdwarf B + white dwarf binary KPD 1930+2752. A supernova type Ia progenitor candidate

scientific article published in January 2007

The metal-enriched host of an energeticγ-ray burst atz ≈ 1.6

scientific article published in Astronomy and Astrophysics

The population of hot subdwarf stars studied with Gaia. I. The catalog of known hot subdwarf stars ⬇️

scientific article

The population of hot subdwarf stars studied with Gaia. II. The Gaia DR2 catalogue of hot subluminous stars

scholarly article

The population of hot subdwarf stars studied with Gaia. III. Catalogue of known hot subdwarf stars: Data Release 2

scientific article published in March 2020

The subdwarf B star SB 290 – A fast rotator on the extreme horizontal branch

scientific article published in Astronomy and Astrophysics

Thermal properties of slowly rotating asteroids: results from a targeted survey

scholarly article

Tidal synchronisation of the subdwarf B binary PG 0101+039

scientific article published in January 2008

Time-resolved high-resolution spectroscopy of the bright pulsating subdwarf B star Balloon090100001

scientific article published in January 2008

Time-resolved spectroscopy of KPD 1930+2752

Towards a European Stratospheric Balloon Observatory: the ESBO design study

scientific article

Two candidate brown dwarf companions around core helium-burning stars ⬇️

scientific article published in January 2014

Two-site photometry and spectroscopy of the rapidly pulsating sdB star EC 22221-3152

scientific article published in January 2017

Unidentified quasars among stationary objects from Gaia DR2

scientific article published in January 2018

Unravelling the baffling mystery of the ultrahot wind phenomenon in white dwarfs

VLT/X-shooter near-infrared spectroscopy and HST imaging of gravitationally lensed z ~ 2 compact quiescent galaxies ⬇️

scientific article published in the Astrophysical Journal

Visible and near-infrared observations of interstellar comet 2I/Borisov with the 10.4-m GTC and the 3.6-m TNG telescopes

scientific article

White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14

scholarly article

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