The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions like massive white dwarfs neutron stars or stellar mass black holes. The existence of such systems is predicted by binary evolution theory and recent discoveries indicate that they exist in our Galaxy. We classified about 1500 hot subdwarf stars from the Sloan Digital Sky Survey (SDSS) by colour selection and visual inspection of their spectra. Stars with high velocities have been reobserved and individual SDSS spectra have been analysed. In total ≃170 radial velocity variable subdwarfs have been discovered and ≃80 of them have been selected as good candidates for follow‐up time resolved spectroscopy to derive their orbital parameters. Up to now we found seven close binary sdBs with short orbital periods ranging from ≃0.21 d to 1.5 d. In our photometric follow‐up campaign we discovered two eclipsing binaries with companions, that are more most likely substellar.
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23 November 2010
17TH EUROPEAN WHITE DWARF WORKSHOP
16–20 August 2010
Tubingen, (Germany)
Research Article|
November 23 2010
Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS)—Status report Available to Purchase
S. Geier;
S. Geier
aDr. Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University, Erlangen‐Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
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U. Heber;
U. Heber
aDr. Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University, Erlangen‐Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
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A. Tillich;
A. Tillich
aDr. Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University, Erlangen‐Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
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H. Hirsch;
H. Hirsch
aDr. Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University, Erlangen‐Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
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S. Müller;
S. Müller
aDr. Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University, Erlangen‐Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
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T. Kupfer;
T. Kupfer
aDr. Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University, Erlangen‐Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
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V. Schaffenroth;
V. Schaffenroth
aDr. Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University, Erlangen‐Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
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L. Classen;
L. Classen
aDr. Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University, Erlangen‐Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
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P. F. L. Maxted;
P. F. L. Maxted
bAstrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
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R. H. O/stensen;
R. H. O/stensen
cInstitute of Astronomy, K.U.Leuven, Celestijnenlaan 200D, B‐3001 Heverlee, Belgium
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B. N. Barlow;
B. N. Barlow
dDepartment of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599‐3255, USA
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T. R. Marsh;
T. R. Marsh
eDepartment of Physics, University of Warwick, Conventry CV4 7AL, UK
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B. T. Gänsicke;
B. T. Gänsicke
eDepartment of Physics, University of Warwick, Conventry CV4 7AL, UK
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R. Napiwotzki;
R. Napiwotzki
fCentre of Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
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S. J. O’Toole
S. J. O’Toole
gAustralian Astronomical Observatory, PO Box 296, Epping, NSW, 1710, Australia
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S. Geier
a
U. Heber
a
A. Tillich
a
H. Hirsch
a
S. Müller
a
T. Kupfer
a
V. Schaffenroth
a
L. Classen
a
P. F. L. Maxted
b
R. H. O/stensen
c
B. N. Barlow
d
T. R. Marsh
e
B. T. Gänsicke
e
R. Napiwotzki
f
S. J. O’Toole
g
aDr. Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University, Erlangen‐Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
bAstrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
cInstitute of Astronomy, K.U.Leuven, Celestijnenlaan 200D, B‐3001 Heverlee, Belgium
dDepartment of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599‐3255, USA
eDepartment of Physics, University of Warwick, Conventry CV4 7AL, UK
fCentre of Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
gAustralian Astronomical Observatory, PO Box 296, Epping, NSW, 1710, Australia
AIP Conf. Proc. 1273, 263–268 (2010)
Citation
S. Geier, U. Heber, A. Tillich, H. Hirsch, S. Müller, T. Kupfer, V. Schaffenroth, L. Classen, P. F. L. Maxted, R. H. O/stensen, B. N. Barlow, T. R. Marsh, B. T. Gänsicke, R. Napiwotzki, S. J. O’Toole; Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS)—Status report. AIP Conf. Proc. 23 November 2010; 1273 (1): 263–268. https://doi.org/10.1063/1.3527819
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