Reference : EXOTIME: searching for planets around pulsating subdwarf B stars
Scientific congresses and symposiums : Paper published in a journal
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/109245
EXOTIME: searching for planets around pulsating subdwarf B stars
English
Schuh, Sonja [ > > ]
Silvotti, Roberto [ > > ]
Lutz, Ronny [ > > ]
Loeptien, Bjorn [ > > ]
Green, Elizabeth M. [ > > ]
Ostensen, Roy H. [ > > ]
Leccia, Silvio [ > > ]
Kim, Seung-Lee [ > > ]
Fontaine, Gilles [ > > ]
Charpinet, Stéphane [ > > ]
Francoeur, Myriam [ > > ]
Randall, Suzanna [ > > ]
Rodriguez-Lopez, Cristina [ > > ]
Van Grootel, Valérie mailto [Université de Toulouse > Laboratoire d'Astrophysique de Toulouse-Tarbes (LATT) > > >]
Odell, Andrew P. [ > > ]
Paparo, Margit [ > > ]
Bognar, Zsofia [ > > ]
Papics, Peter [ > > ]
Nagle, Thorsten [ > > ]
Beeck, Benjamin [ > > ]
Hundertmark, Markus [ > > ]
Stahn, Thorsten [ > > ]
Dreizler, Stefan [ > > ]
Hessman, Frederic V. [ > > ]
Dall'Ora, Massimo [ > > ]
Mancini, Dario [ > > ]
Cortecchia, Fausto [ > > ]
Benatti, Serena [ > > ]
Claudi, Riccardo [ > > ]
Janulis, Rimvydas [ > > ]
Oct-2010
Astrophysics & Space Science
Springer Science & Business Media B.V.
329
231-242
Yes (verified by ORBi)
No
International
0004-640X
Dordrecht
The Netherlands
Fourth meeting on hot B subdwarfs and related objects
du 20 au 24 juillet 2009
Shanghai
Chine
[en] Stars: subdwarfs ; Stars: oscillations ; Stars: evolution ; Stars: planetary systems ; Stars: Individual: HS 2201+2610 ; Stars: Individual: HS 0702+6043 ; Stars: Individual: HS 0444+0458
[en] In 2007, a companion with planetary mass was found around the pulsating subdwarf B star V391 Pegasi with the timing method, indicating that a previously undis- covered population of substellar companions to apparently single subdwarf B stars might exist. Following this serendip- itous discovery, the EXOTIME (http://www.na.astro.it/ ~silvotti/exotime/) monitoring program has been set up to follow the pulsations of a number of selected rapidly pul- sating subdwarf B stars on time scales of several years with two immediate observational goals:
(1) determine P ̇ of the pulsational periods P (2) search for signatures of substellar companions in O– C residuals due to periodic light travel time variations, which would be tracking the central star’s companion-
induced wobble around the centre of mass
These sets of data should therefore, at the same time, on the one hand be useful to provide extra constraints for classical asteroseismological exercises from the P ̇ (comparison with “local” evolutionary models), and on the other hand allow one to investigate the preceding evolution of a target in terms of possible “binary” evolution by extending the otherwise unsuccessful search for companions to potentially very low masses.
While timing pulsations may be an observationally ex- pensive method to search for companions, it samples a dif- ferent range of orbital parameters, inaccessible through or- bital photometric effects or the radial velocity method: the latter favours massive close-in companions, whereas the timing method becomes increasingly more sensitive toward wider separations.
In this paper we report on the status of the on-going ob- servations and coherence analysis for two of the currently five targets, revealing very well-behaved pulsational charac- teristics in HS 0444+0458, while showing HS 0702+6043 to be more complex than previously thought.
http://hdl.handle.net/2268/109245

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