2007A&A...472..657L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST15:47:05

2007A&A...472..657L - Astronomy and Astrophysics, volume 472, 657-664 (2007/9-3)

Planets around evolved intermediate-mass stars. I. Two substellar companions in the open clusters NGC 2423 and NGC 4349.

LOVIS C. and MAYOR M.

Abstract (from CDS):

Many efforts are being made to characterize extrasolar planetary systems and unveil the fundamental mechanisms of planet formation. An important aspect of the problem, which remains largely unknown, is to understand how the planet formation process depends on the mass of the parent star. In particular, as most planets discovered to date orbit a solar-mass primary, little is known about planet formation around more massive stars. To investigate this point, we present first results from a radial velocity planet search around red giants in the clump of intermediate-age open clusters. We choose clusters harbouring red giants with masses between 1.5 and 4M, using the well-known cluster parameters to accurately determine the stellar masses. We are therefore exploring a poorly-known domain of primary masses, which will bring new insights into the properties of extrasolar planetary systems. We follow a sample of about 115 red giants with the Coralie and HARPS spectrographs to obtain high-precision radial velocity (RV) measurements and detect giant planets around these stars. We use bisector and activity index diagnostics to distinguish between planetary-induced RV variations and stellar photospheric jitter. We present the discoveries of a giant planet and a brown dwarf in the open clusters NGC 2423 and NGC 4349, orbiting the 2.4M-star NGC 2423 No. 3 (TYC 5409-2156-1) and the 3.9M-star NGC 4349 No. 127 (TYC 8975-2606-1). These low-mass companions have orbital periods of 714 and 678 days and minimum masses of 10.6 and 19.8MJup, respectively. Combined with the other known planetary systems, these detections indicate that the frequency of massive planets is higher around intermediate-mass stars, and therefore probably scales with the mass of the protoplanetary disk.

Abstract Copyright:

Journal keyword(s): stars: individual: NGC2423 No. 3 - stars: individual: NGC4349 No. 127 - stars: planetary systems - Galaxy: open clusters and associations: individual: NGC 2423 - Galaxy: open clusters and associations: individual: NGC 4349 - techniques: radial velocities

Simbad objects: 21

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Number of rows : 21

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 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2654 0
2 NGC 2360 OpC 07 17 43 -15 38.5           ~ 168 0
3 NGC 2423 OpC 07 37 06 -13 52.3           ~ 118 0
4 BD-13 2130b Pl 07 37 09.2333520617 -13 54 23.954320858           ~ 15 1
5 BD-13 2130 * 07 37 09.2333520617 -13 54 23.954320858   11.31 10.04     G5IV-V/K2III 50 1
6 NGC 2447 OpC 07 44 30 -23 51.4           ~ 117 1
7 NGC 2539 OpC 08 10 37 -12 49.1   7.05 6.5     ~ 117 0
8 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
9 NGC 3114 OpC 10 02 36 -60 07.2   4.47 4.2     ~ 166 0
10 IC 2714 OpC 11 17 27 -62 44.0     8.2     ~ 75 0
11 NGC 3680 OpC 11 25 38 -43 14.6   8.40 7.6     ~ 290 0
12 NGC 4349 OpC 12 24 08 -61 52.3   8.01 7.4     ~ 88 0
13 NGC 4349 127 * 12 24 35.4709937902 -61 49 11.859118499   12.85 10.82     ~ 36 1
14 NGC 4349 127b Pl 12 24 35.4709937902 -61 49 11.859118499           ~ 13 1
15 NGC 5822 OpC 15 04 28 -54 23.4     6.5     ~ 173 0
16 HD 137510b Pl? 15 25 53.2707121018 +19 28 50.529629119           ~ 12 0
17 IC 4651 OpC 17 24 49 -49 56.0           ~ 309 0
18 NGC 6633 OpC 18 27 31.2 +06 34 12           ~ 323 0
19 IC 4756 OpC 18 38 31.2 +05 29 24           ~ 199 0
20 * 59 Dra b Pl? 19 09 09.8793494721 +76 33 37.808283506           ~ 7 0
21 HD 184860b Pl? 19 36 45.63937 -10 26 36.3596           ~ 4 1

    Equat.    Gal    SGal    Ecl

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2020.07.16-15:47:05

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