2008A&A...483..869K


Query : 2008A&A...483..869K

2008A&A...483..869K - Astronomy and Astrophysics, volume 483, 869-874 (2008/6-1)

A probable close brown dwarf companion to GJ 1046 (M2.5V).

KUERSTER M., ENDL M. and REFFERT S.

Abstract (from CDS):

Brown dwarf companions to stars at separations of a few AU or less are rare objects, and none have been found so far around early-type M dwarfs (M0V-M5V). With GJ 1046 (M2.5V), a strong candidate for such a system with a separation of 0.42 AU is presented. We aim at constraining the mass of the companion in order to decide whether it is a brown dwarf or a low-mass star. We employed precision RV measurements to determine the orbital parameters and the minimum companion mass. We then derived an upper limit to the companion mass from the lack of disturbances of the RV measurements by a secondary spectrum. An even tighter upper limit is subsequently established by combining the RV-derived orbital parameters with the recent new version of the Hipparcos Intermediate Astrometric Data. For the mass of the companion, we derive m≥26.9MJup from the RV data. Based on the RV data alone, the probability that the companion exceeds the stellar mass threshold is just 6.2% . The absence of effects from the secondary spectrum lets us constrain the companion mass to m≤229MJup. The combination of RV and Hipparcos data yields a 3σ upper mass limit to the companion mass of 112MJup with a formal optimum value at m=47.2MJup. From the combination of RV and astrometric data, the chance probability that the companion is a star is 2.9% . We have found a low-mass, close companion to an early-type M dwarf. While the most likely interpretation of this object is that it is a brown dwarf, a low-mass stellar companion is not fully excluded.

Abstract Copyright:

Journal keyword(s): stars: low-mass, brown dwarfs - stars: binaries: spectroscopic - stars: individual: GJ1046 - astrometry

Simbad objects: 11

goto Full paper

goto View the references in ADS

Number of rows : 11
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 * 109 Psc PM* 01 44 55.8255136824 +20 04 59.336892804   6.984 6.279     G3Va 264 2
2 L 440-30 PM* 02 19 10.0756963004 -36 46 41.157730201 14.361 13.149 11.595 10.527 9.211 M2.5+V 49 1
3 HD 33636 Pe* 05 11 46.4494089528 +04 24 12.742146936   7.64   6.6   G0V_CH-0.3 175 1
4 HD 38529 PM* 05 46 34.9131388488 +01 10 05.502949860       5.4   G8III/IV 329 2
5 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 481 0
6 LP 732-94 LM* 11 21 49.1708652037 -13 13 08.693807585     19.57     M8.5V 126 0
7 HD 114762 SB* 13 12 19.7410686234 +17 31 01.630334317 7.78         F9VgF8mF4+M6?V 527 1
8 HD 137510 PM* 15 25 53.2697518752 +19 28 50.545457724   6.872 6.241     G0IV-V 105 0
9 CD-44 11909 PM* 17 37 03.6654566674 -44 19 09.166492972 13.791 12.593 10.946 9.729 8.145 M3.5 108 0
10 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 739 2
11 HD 168443 PM* 18 20 03.9332862096 -09 35 44.614653900   7.62 6.92     G6V 294 1

To bookmark this query, right click on this link: simbad:objects in 2008A&A...483..869K and select 'bookmark this link' or equivalent in the popup menu


2022.05.21-23:16:12

© Université de Strasbourg/CNRS

    • Contact