2012A&A...540A.141S


Query : 2012A&A...540A.141S

2012A&A...540A.141S - Astronomy and Astrophysics, volume 540A, 141-141 (2012/4-1)

Planetary companions around the metal-poor star HIP 11952.

SETIAWAN J., ROCCATAGLIATA V., FEDELE D., HENNING T., PASQUALI A., RODRIGUEZ-LEDESMA M.V., CAFFAU E., SEEMANN U. and KLEMENT R.J.

Abstract (from CDS):

We carried out a radial-velocity survey to search for planets around metal-poor stars. In this paper we report the discovery of two planets around HIP 11952, a metal-poor star with [Fe/H]=-1.9 that belongs to our target sample. Radial velocity variations of HIP 11952 were monitored systematically with FEROS at the 2.2m telescope located at the ESO La Silla observatory from August 2009 until January 2011. We used a cross-correlation technique to measure the stellar radial velocities (RV). We detected a long-period RV variation of 290d and a short-period one of 6.95d. The spectroscopic analysis of the stellar activity reveals a stellar rotation period of 4.8d. The Hipparcos photometry data shows intra-day variabilities, which give evidence for stellar pulsations. Based on our analysis, the observed RV variations are most likely caused by the presence of unseen planetary companions. Assuming a primary mass of 0.83M, we computed minimum planetary masses of 0.78MJup for the inner and 2.93MJup for the outer planet. The semi-major axes are a1=0.07AU and a2=0.81AU, respectively. HIP 11952 is one of very few stars with [Fe/H]←1.0 which have planetary companions. This discovery is important to understand planet formation around metal-poor stars.

Abstract Copyright:

Journal keyword(s): stars: abundances - techniques: spectroscopic - planetary systems - techniques: radial velocities - stars: individual: HIP 11952

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1171 1
2 HD 16031 PM* 02 34 11.0485653360 -12 23 03.444110700 9.99 10.21 9.77     F0V 163 1
3 CD-36 1052 HB* 02 47 37.4429774568 -36 06 27.032483376   10.426 9.982 9.818 9.37 Fwl 69 1
4 HD 114752 * 13 13 14.6191694496 -43 49 47.577506664   10.14 9.17     K0III 9 0
5 HE 1523-0901 Pe* 15 26 01.0697532504 -09 11 38.885639784   12.37 11.50 10.476 9.863 CEMP 66 0
6 NAME Arcturus Stream MGr ~ ~           ~ 70 1

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2022.05.24-12:02:27

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