2010A&A...513L...8F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST10:38:31

2010A&A...513L...8F - Astronomy and Astrophysics, volume 513, L8-8 (2010/4-1)

Evidence against the young hot-Jupiter around BD+20 1790.

FIGUEIRA P., MARMIER M., BONFILS X., DI FOLCO E., UDRY S., SANTOS N.C., LOVIS C., MEGEVAND D., MELO C.H.F., PEPE F., QUELOZ D., SEGRANSAN D., TRIAUD A.H.M.J. and VIANA ALMEIDA P.

Abstract (from CDS):

The young active star BD+20 1790 has been inferred to host a substellar companion from radial-velocity measurements that detected the reflex motion induced on the parent star. We attempt to completely characterize the radial-velocity signal in order to assess its nature. We used the CORALIE spectrograph to obtain precise (∼10m/s) radial-velocity measurements of this active star, while characterizing the bisector span variations. We took particular care to correctly sample both the proposed planetary orbital period, of 7.8-days, and the stellar rotation period, of 2.4-days. We measure a smaller radial-velocity signal (with peak-to-peak variations <500m/s) than reported previously, and of different amplitude for two different campaigns. A periodicity similar to the rotational period is found in the data, as well as a clear correlation between radial velocities and bisector span. These results imply that the radial-velocity variations of the star are photospheric in origin and not caused by a barycentric movement movement of the star, and contradict the previous detection of a hot-Jupiter.

Abstract Copyright:

Journal keyword(s): instrumentation: spectrographs - methods: observational - techniques: radial velocities - planetary systems - stars: individual: BD+20 1790 - stars: activity

VizieR on-line data: <Data not supplied by the author>

CDS comments: Fig.1 and Fig.2 BD +20 1270 is a misprint for BD +20 1790.

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 BD+20 1790 BY* 07 23 43.5892690689 +20 24 58.654590844   11.08 10.001 9.43 8.522 K5e 75 0
2 * 51 Peg Ro* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1071 1

    Equat.    Gal    SGal    Ecl

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2020.07.11-10:38:31

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