2009ApJ...707..768N


Query : 2009ApJ...707..768N

2009ApJ...707..768N - Astrophys. J., 707, 768-777 (2009/December-2)

Substellar-mass companions to the K-dwarf BD+14 4559 and the K-giants HD 240210 and BD+20 2457.

NIEDZIELSKI A., NOWAK G., ADAMOW M. and WOLSZCZAN A.

Abstract (from CDS):

We present the discovery of substellar-mass companions to three stars by the ongoing Penn State-ToruN Planet Search conducted with the 9.2 m Hobby-Eberly Telescope. The K2-dwarf, BD+14 4559, has a 1.5 MJminimum mass companion with the orbital period of 269 days and shows a non-linear, long-term radial velocity (RV) trend, which indicates a possible presence of another planet-mass body in the system. The K3-giant, HD 240210, exhibits RV variations that require modeling with multiple orbits, but the available data are not yet sufficient to do it unambiguously. A tentative, one-planet model calls for a 5.2 MJ minimum mass planet in a 502 day orbit around the star. The most massive of the three stars, the K2-giant, BD+20 2457, whose estimated mass is 2.8±1.5 M, has two companions with the respective minimum masses of 21.4 MJ and 12.5 MJand orbital periods of 380 and 622 days. Depending on the unknown inclinations of the orbits, the currently very uncertain mass of the star, and the dynamical properties of the system, it may represent the first detection of two brown dwarf-mass companions orbiting a giant. The existence of such objects will have consequences for the interpretation of the so-called brown dwarf desert known to exist in the case of solar-mass stars.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual (BD+14 4559, HD 240210, BD+20 2457) - stars: low-mass, brown dwarfs

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 BD+20 2457c Pl 10 16 44.8671846183 +19 53 29.010025880           ~ 20 1
2 BD+20 2457 * 10 16 44.8671846183 +19 53 29.010025880   10.99 9.74     K2 58 1
3 BD+20 2457b Pl 10 16 44.8671846183 +19 53 29.010025880           ~ 21 1
4 HD 102272 * 11 46 23.5354430592 +14 07 26.352184620   9.71 8.71     K2 59 1
5 HD 168443 PM* 18 20 03.9332862096 -09 35 44.614653900   7.62 6.92     G6V 310 1
6 BD+70 1068 * 19 29 11.8398348696 +70 29 13.524970488   10.40 9.26     G8III 9 0
7 BD+14 4559b Pl 21 13 35.9901678120 +14 41 21.785788608           ~ 17 1
8 BD+14 4559 PM* 21 13 35.9901678120 +14 41 21.785788608       9.1   K5 43 1
9 HD 240210b Pl 23 10 29.2262536632 +57 01 46.027364808           ~ 10 1
10 HD 240210 * 23 10 29.2262536632 +57 01 46.027364808   9.88 8.27     K7 31 1

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