2017A&A...608L...9L

Query : 2017A&A...608L...9L

2017A&A...608L...9L - Astronomy and Astrophysics, volume 608, L9-9 (2017/12-1)

Discovery of a stellar companion to HD 131399A.

LAGRANGE A.-M., KEPPLER M., BEUST H., RODET L., MEUNIER N., LILLO-BOX J., BONNEFOY M. and GALLAND F.

Abstract (from CDS):

Context. The giant exoplanets imaged on wide orbits (≥10au) around young stars challenge the classical theories of planet formation. The presence of perturbing bodies could have played a role in the dynamical evolution of the planets once formed.
Aims. We aim to search for close companions to HD 131399, a star around which a giant planet has been discovered, at a projected separation of about 80au. The star also appears to be a member of a wide (320au) binary system.
Methods. We recorded HARPS high resolution spectra in January 2017.
Results. We find that HD 131399A is probably seen close to pole-on. We discover a low mass star companion that orbits with a period of about 10 days on a misaligned orbit. Even though the companion does not have an impact on the current dynamical evolution of the planet, it could have played a role in its setting and in clearing the circumstellar disk from which the planet may originate.

Abstract Copyright: © ESO, 2017

Journal keyword(s): techniques: radial velocities - planetary systems - binaries: close - stars: individual: HD 131399 - stars: individual: HD 131399

Simbad objects: 14

Full paper

View the references in ADS

Number of rows : 14

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	SCR J0103-5515	SB*	01 03 35.655120	-55 15 56.24316		16.99	15.40	14.96	12.09	M5.0	41	0
2	V* FW Tau	Or*	04 29 29.7076208400	+26 16 52.768899480				15.85		M5.5	135	0
3	* 51 Eri b	Pl	04 37 36.1323118067	-02 28 24.778826936						~	172	0
4	* 51 Eri	PM*	04 37 36.1326090888	-02 28 24.775726260		5.486	5.209			F0IV	234	0
5	HD 106906	*	12 17 53.1915103944	-55 58 31.893027240		8.95	8.89	8.46		F5V	146	0
6	NAME Lower Centaurus Crux	As*	12 19	-57.1						~	459	1
7	BD+13 2618	Er*	13 00 46.5566863405	+12 22 32.677229903	12.314	11.233	9.750	8.785	7.653	M0V	337	1
8	HD 131399B	**	14 54 25.1390494392	-34 08 36.372719184						~	5	1
9	NAME HD 131399Ab	err	14 54 25.3	-34 08 34						~	22	1
10	HD 131399A	*	14 54 25.3089604512	-34 08 34.038969972		7.16	7.08			A1V	14	0
11	HD 131399	**	14 54 25.30919	-34 08 34.0412		7.19	7.08	8.33		A1V	46	0
12	NAME Upper Sco-Cen	As*	16 15	-24.2						~	1298	1
13	ROXs 42B	TT*	16 31 15.0183260016	-24 32 43.715044896			14.27	13.03	11.72	~	56	0
14	HD 218396	El*	23 07 28.7157209544	+21 08 03.310767492		6.21	5.953			F0+VkA5mA5	1102	0

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