2011A&A...525A..85E


Query : 2011A&A...525A..85E

2011A&A...525A..85E - Astronomy and Astrophysics, volume 525A, 85-85 (2011/1-1)

SOPHIE velocimetry of Kepler transit candidates. I. Detection of the low-mass white dwarf KOI 74b.

EHRENREICH D., LAGRANGE A.-M., BOUCHY F., PERRIER C., HEBRARD G., BOISSE I., BONFILS X., ARNOLD L., DELFOSSE X., DESORT M., DIAZ R.F., EGGENBERGER A., FORVEILLE T., LOVIS C., MOUTOU C., PEPE F., PONT F., SANTOS N.C., SANTERNE A., SEGRANSAN D., UDRY S. and VIDAL-MADJAR A.

Abstract (from CDS):

The Kepler mission has detected transits and occultations of a hot compact object around an early-type star, the Kepler Object of Interest KOI 74. The mass of this transiting object was photometrically assessed in a previous study using the presence of the relativistic beaming effect (so-called ``Doppler boosting'') in the light curve. Our aim was to provide a spectroscopic validation of this pioneering approach. We measured the radial velocity variations of the A1V star KOI 74 with the SOPHIE spectrograph at the 1.93-m telescope of the Observatoire de Haute-Provence (France). Radial velocity measurements of this star are challenging because of the high level of stellar pulsations and the few available spectral lines. Using a technique dedicated to early-type main-sequence stars, we measured radial velocity variations compatible with a companion of mass 0.252±0.025M, in good agreement with the value derived from the Kepler light curve. This work strengthens the scenario suggesting that KOI 74 is a blue straggler orbited by a stellar core despoiled of its envelope, the low-mass white dwarf KOI 74b.

Abstract Copyright:

Journal keyword(s): techniques: radial velocities - stars: early-type - white dwarfs - blue stragglers - binaries: eclipsing - satellites: planets, general

CDS comments: Fig.6 Some objects not identified (incomplete format).

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 PSR J0023-72U Psr 00 24 09.8325 -72 03 59.667           ~ 58 2
2 LP 413-40 WD* 03 45 16.8306937296 +17 48 08.702047980   17.1   16.3   DA 74 0
3 V* RR Cae WD* 04 21 05.5631820426 -48 39 07.061113433 14.50 14.92 14.40     DA7.8 159 1
4 * alf CMa B WD* 06 45 09.3041925037 -16 43 00.724740067   8.41 8.44     DA1.9 546 1
5 * alf CMi B WD* 07 39 17.8800 +05 13 26.800   10.7 10.92     DQZ 162 0
6 NGC 2682 OpC 08 51 23.0 +11 48 50           ~ 2363 0
7 Cl* NGC 2682 SAND 1284 BS* 08 51 34.3150275672 +11 51 10.497400452   11.17 10.92   10.622 B9V 98 0
8 * alf Leo PM* 10 08 22.31099 +11 58 01.9516 0.88 1.24 1.40 1.37 1.47 B8IVn 858 1
9 PSR J1012+5307 Psr 10 12 33.4345449600 +53 07 02.548542576     19.5     DA 382 1
10 GALEX J123410.3-022803 WD* 12 34 10.3676638032 -02 28 02.806799988   17.7   18.4   DA 40 0
11 SDSS J125733.63+542850.5 WD* 12 57 33.6542910024 +54 28 50.449435680           DA 43 0
12 V* DE CVn ** 13 26 53.2712830008 +45 32 46.685746104   14.23 12.96 12.59   M3V+DA 57 0
13 V* QS Vir SB* 13 49 52.0029035208 -13 13 37.000132212 14.27 14.98 14.40 14.37   DA3+dM 136 1
14 V* GK Vir WD* 14 15 36.4128319176 +01 17 18.226779000   17.0       DAe+M 105 0
15 V* NN Ser RS* 15 52 56.1203524080 +12 54 44.429312196     16.51     DAO1+M4 275 0
16 PSR J1910-5959A Psr 19 11 42.7562 -59 58 26.900 22.02 22.13 22.03     DA5 92 1
17 KOI-964 EB* 19 13 59.8696461528 +47 59 47.244395688           ~ 49 0
18 CoRoT-3b Pl 19 28 13.2642131544 +00 07 18.613986132           ~ 138 1
19 CoRoT-3 EB* 19 28 13.2642131544 +00 07 18.613986132   14.199 13.292 13.099 12.54 F3V 79 1
20 KOI-81 EB* 19 35 08.5764186408 +45 01 06.455313660   11.51 11.32     B8V 54 0
21 KOI-81b Pl? 19 35 08.5764186408 +45 01 06.455313660           ~ 7 0
22 * tet Cyg PM* 19 36 26.5330717650 +50 13 15.965003998 4.83 4.86 4.48 4.13 3.92 F3+V 349 1
23 KPD 1946+4340 HS* 19 47 42.8876526504 +43 47 30.754543092 13.05 14.06 14.23 14.92   sdOB+D 60 0
24 KOI-74b Pl? 19 53 17.8104467976 +42 23 18.509696700           ~ 8 1
25 KOI-74 EB* 19 53 17.8104467976 +42 23 18.509696700   10.832 10.896 10.976   A1V 63 1

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