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

Abstract

The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims to find sdBs with compact companions like massive white dwarfs, neutron stars or black holes. Here we provide classifications, atmospheric parameters and a complete radial velocity (RV) catalogue containing 1914 single measurements for an sample of 177 hot subluminous stars discovered based on SDSS DR7. 110 stars show significant RV variability, while 67 qualify as candidates. We constrain the fraction of close massive compact companions {of hydrogen-rich hot subdwarfs} in our sample to be smaller than $\sim 1.3\%$, which is already close to the theoretical predictions. However, the sample might still contain such binaries with longer periods exceeding $\sim 8\mathrm{d}$. We detect a mismatch between the $\Delta R{V}_{\max }$-distribution of the sdB and the more evolved sdOB and sdO stars, which challenges our understanding of their evolutionary connection. Furthermore, irregular RV variations of unknown origin with amplitudes of up to $\sim 180\mathrm{km}{\mathrm{s}}^{-1}$ on timescales of years, days and even hours have been detected in some He-sdO stars. They might be connected to irregular photometric variations in some cases.

14 pages, 9 figures, A&A accepted

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Cited by in corpus (25)

• White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14
• Population of hot subdwarf stars studied with Gaia III. Catalogue of known hot subdwarf stars: Data Release 2
• The population of hot subdwarf stars studied with Gaia -- IV. Catalogues of hot subluminous stars based on Gaia EDR3
• A stripped helium star in the potential black hole binary LB-1
• Hot subdwarf Atmospheric parameters, Kinematics, and Origins -- Based on 1587 hot subdwarf stars observed in Gaia DR2 and LAMOST DR7
• 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
• Radial velocity variability and evolution of hot subdwarf stars
• Blue Large-Amplitude Pulsators: the Possible Surviving Companions of Type Ia Supernovae
• Discovery of a highly magnetic He-sdO star from a double-degenerate binary merger
• Clean catalogues of blue horizontal-branch stars using Gaia EDR3
• Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. II. Kinematics
• Spectral analysis of four surprisingly similar hot hydrogen-rich subdwarf O stars
• Discovery of new TESS pulsating hot subdwarfs
• Mass distribution for single-lined hot subdwarf stars in LAMOST
• Hot subdwarf B stars with neutron star components II: Binary population synthesis
• Properties and applications of a predicted population of runaway He-sdO/B stars ejected from single degenerate He-donor SNe
• A spectroscopic and kinematic survey of fast hot subdwarfs
• An extremely hot white dwarf with a rapidly rotating K-type subgiant companion: UCAC2 46706450
• Evolutionary Constraints on the Long-period Subdwarf B Binary PG 1018-047
• Confirming new white dwarf-ultracool dwarf binary candidates
• Identification of new hot subdwarf binary systems by means of Virtual Observatory tools
• The first massive compact companion in a wide orbit around a hot subdwarf star
• Kinematics of Hot Subdwarfs from the Gaia DR2 Catalogue
• Discovery of periodic variables in the hot subdwarf catalogue through a systematic search in Zwicky Transient Facility data
• Discovery and analysis of three magnetic hot subdwarf stars: evidence for merger-induced magnetic fields