2011
DOI: 10.1051/0004-6361/201015316
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The MUCHFUSS project – searching for hot subdwarf binaries with massive unseen companions

Abstract: The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding sdBs with compact companions like supermassive white dwarfs (M > 1.0 M ), neutron stars or black holes. The existence of such systems is predicted by binary evolution theory and recent discoveries indicate that they are likely to exist in our Galaxy. A determination of the orbital parameters is sufficient to put a lower limit on the companion mass by calculating the binary mass function. If this lower li… Show more

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Cited by 102 publications
(114 citation statements)
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“…The discovery of RV variable He-sdOs (Green et al 2008;Geier et al 2011a) on the other hand seemed to be inconsistent with the idea that those stars are formed by He-WD mergers (e.g. Webbink 1984) because merger products are expected to be single stars.…”
Section: Irregular Rv Variations Of Helium-rich Hot Subdwarf Starsmentioning
confidence: 99%
See 1 more Smart Citation
“…The discovery of RV variable He-sdOs (Green et al 2008;Geier et al 2011a) on the other hand seemed to be inconsistent with the idea that those stars are formed by He-WD mergers (e.g. Webbink 1984) because merger products are expected to be single stars.…”
Section: Irregular Rv Variations Of Helium-rich Hot Subdwarf Starsmentioning
confidence: 99%
“…We have obtained those individual spectra for stars brighter than g = 18.5 mag. In addition, second epoch medium resolution spectroscopy was obtained from SDSS as well as our own observations, using ESO-VLT/FORS1, WHT/ISIS, CAHA-3.5 m/TWIN and ESO-NTT/EFOSC2 (see Table 1, Geier et al 2011a). Typical exposure times ranged from 10 min to 20 min.…”
Section: The Muchfuss Projectmentioning
confidence: 99%
“…PG 1621+4737 has been found in the course of the MUCHFUSS (massive unseen companions to hot faint underluminous stars from SDSS, Geier et al 2011a) project by Geier et al (2010), who determined the period and estimated that the companion to the sdB star is a very late-type MS star or a BD. The system parameters are not constrained and there are still no published mid-eclipse times.…”
Section: Appendix A: Notes On Individual Systemsmentioning
confidence: 99%
“…The project, Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS), aims to find sdBs with compact companions, such as massive white dwarfs (M > 1.0 M ), neutron stars, or black holes. Details about target selection and the scope of the project can be found in Geier et al (2011b). As one of two selection criteria, sdBs with radial velocity (RV) variations on timescales of half an hour or less were selected from the Sloan Digital Sky Survey (SDSS).…”
Section: Introductionmentioning
confidence: 99%