2019A&A...626A..99J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:14:03

2019A&A...626A..99J - Astronomy and Astrophysics, volume 626A, 99-99 (2019/6-1)

The B-Star Exoplanet Abundance Study: a co-moving 16-25 MJup companion to the young binary system HIP 79098.

JANSON M., ASENSIO-TORRES R., ANDRE D., BONNEFOY M., DELORME P., REFFERT S., DESIDERA S., LANGLOIS M., CHAUVIN G., GRATTON R., BOHN A.J., ERIKSSON S.C., MARLEAU G.-D., MAMAJEK E.E., VIGAN A. and CARSON J.C.

Abstract (from CDS):

Wide low-mass substellar companions are known to be very rare among low-mass stars, but appear to become increasingly common with increasing stellar mass. However, B-type stars, which are the most massive stars within ∼150pc of the Sun, have not yet been examined to the same extent as AFGKM-type stars in that regard. In order to address this issue, we launched the ongoing B-star Exoplanet Abundance Study (BEAST) to examine the frequency and properties of planets, brown dwarfs, and disks around B-type stars in the Scorpius-Centaurus (Sco-Cen) association; we also analyzed archival data of B-type stars in Sco-Cen. During this process, we identified a candidate substellar companion to the B9-type spectroscopic binary HIP 79098 AB, which we refer to as HIP 79098 (AB)b. The candidate had been previously reported in the literature, but was classified as a background contaminant on the basis of its peculiar colors. Here we demonstrate that the colors of HIP 79098 (AB)b are consistent with several recently discovered young and low-mass brown dwarfs, including other companions to stars in Sco-Cen. Furthermore, we show unambiguous common proper motion over a 15-yr baseline, robustly identifying HIP 79098 (AB)b as a bona fide substellar circumbinary companion at a 345±6AU projected separation to the B9-type stellar pair. With a model-dependent mass of 16-25 MJup yielding a mass ratio of <1%, HIP 79098 (AB)b joins a growing number of substellar companions with planet-like mass ratios around massive stars. Our observations underline the importance of common proper motion analysis in the identification of physical companionship, and imply that additional companions could potentially remain hidden in the archives of purely photometric surveys.

Abstract Copyright: © ESO 2019

Journal keyword(s): brown dwarfs - stars: early-type - planets and satellites: detection

Simbad objects: 30

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Number of rows : 30

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 NAME THA As* 00 00 -62.0           ~ 340 0
2 V* GU Psc B BD* 01 12 36.53808 +17 04 29.9424           T3.5 49 0
3 TYC 621-21-1 * 01 41 10.1907750667 +09 41 40.887286214   11.49 10.98     ~ 2 0
4 NAME Columba Association As* 06 14.0 -40 03           ~ 204 0
5 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1532 1
6 NAME TW Hya Association As* 11 01.9 -34 42           ~ 819 0
7 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 239 0
8 HD 106906B BD* 12 17 52.61 -55 58 26.6           L2.5 53 0
9 NAME VHS J1256-1257B BD* 12 56 01.83264 -12 57 27.6912           L8.0 32 0
10 HD 115470 * 13 18 05.1042056946 -44 03 19.376995020   6.77 6.79     B9.5V 21 0
11 HD 116434C BD* 13 24 36.13 -51 30 16.7           L5-7 30 1
12 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 557 0
13 NAME HD 131399Ab Pl? 14 54 25.3091662743 -34 08 34.036971582           ~ 18 0
14 HD 143567 * 16 01 55.4546289923 -21 58 49.397570493   7.27 7.19 7.87   B9V 102 0
15 HD 143567B LM* 16 01 55.65696 -21 58 53.0076           M8 26 0
16 NAME UScoCTIO 108B BD? 16 05 54.09504 -18 18 48.8592           ~ 40 0
17 UCAC4 332-079645 Ro* 16 08 39.0877549293 -23 40 05.623161133       14.01 11.63 ~ 8 0
18 HD 144844 V* 16 08 43.7199351602 -23 41 07.451972503 5.59 5.90 5.88     B9V 138 0
19 HD 144844B LM* 16 08 43.86 -23 41 08.8           ~ 1 0
20 2MASS J16084836-2341209 LM* 16 08 48.3732745656 -23 41 20.910917094           M5.0 13 0
21 RX J1609.5-2105B LM* 16 09 30.37 -21 04 57.0           ~ 94 0
22 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
23 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1120 1
24 * zet Del B BD* 20 35 19.05 +14 40 15.6           L5 8 0
25 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 101 0
26 HD 206893b Pl? 21 45 21.9056012837 -12 47 00.068065895           ~ 10 0
27 HD 218396e Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 124 1
28 HD 218396d Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 171 1
29 NAME AB Dor Moving Group MGr ~ ~           ~ 355 0
30 NAME Argus Association As* ~ ~           ~ 162 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:14:03

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