2012A&A...539A..72D


Query : 2012A&A...539A..72D

2012A&A...539A..72D - Astronomy and Astrophysics, volume 539A, 72-72 (2012/3-1)

High-resolution imaging of young M-type stars of the solar neighbourhood: probing for companions down to the mass of Jupiter.

DELORME P., LAGRANGE A.M., CHAUVIN G., BONAVITA M., LACOUR S., BONNEFOY M., EHRENREICH D. and BEUST H.

Abstract (from CDS):

High-contrast imaging is a powerful technique when searching for gas giant planets and brown dwarfs orbiting at separations greater than several AU. Around solar-type stars, giant planets are expected to form by core accretion or by gravitational instability, but since core accretion is increasingly difficult as the primary star becomes lighter, gravitational instability would be a probable formation scenario for still-to-find distant giant planets around a low-mass star. A systematic survey for such planets around M dwarfs would therefore provide a direct test of the efficiency of gravitational instability. We search for gas giant planets orbiting late-type stars and brown dwarfs of the solar neighbourhood. We obtained deep high-resolution images of 16 targets with the adaptive optic system of VLT-NACO in the L' band, using direct imaging and angular differential imaging. This is currently the largest and deepest survey for Jupiter-mass planets around M-dwarfs. We developed and used an integrated reduction and analysis pipeline to reduce the images and derive our 2D detection limits for each target. The typical contrast achieved is about 9mag at 0.5'' and 11mag beyond 1''. For each target we also determine the probability of detecting a planet of a given mass at a given separation in our images. We derived accurate detection probabilities for planetary companions, taking orbital projection effects into account, with in average more than 50% probability to detect a 3MJup companion at 10AU and a 1.5MJup companion at 20AU, bringing strong constraints on the existence of Jupiter-mass planets around this sample of young M-dwarfs.

Abstract Copyright:

Journal keyword(s): planets and satellites: atmospheres - brown dwarfs - stars: late-type - methods: data analysis - planetary systems - stars: rotation

Simbad objects: 26

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Number of rows : 26
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 EXO 0235.2-5216 Er* 02 36 51.7013280528 -52 03 03.600913140   13.59 12.411   9.727 M2Ve 59 0
2 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2861 0
3 StKM 1-497 TT* 04 37 37.4553491592 -02 29 28.950973764   12.04 10.59   8.59 M1.1V 119 0
4 2MASSI J0443376+000205 LM* 04 43 37.6085840376 +00 02 05.106068520     19.6   15.877 M9.0V 47 0
5 V* V1005 Ori BY* 04 59 34.8342878424 +01 47 00.669818328   11.48 10.107 9.603 8.239 M0Ve 322 0
6 CD-57 1054 PM* 05 00 47.1296589456 -57 15 25.452888732   11.36 9.977 9.889 8.177 M0Ve 108 0
7 BD-21 1074A Er* 05 06 49.9162124448 -21 35 09.128916564   11.86 10.41 9.40 9.07 M2 74 0
8 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1789 1
9 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 425 0
10 BD+01 2447 PM* 10 28 55.5512830314 +00 50 27.598904576 12.389 11.151 9.650 8.617 7.389 dM2 283 0
11 NAME TW Hya Association As* 11 01.9 -34 42           ~ 889 0
12 TWA 26 LM* 11 39 51.1378374696 -31 59 21.443660124         15.83 M8e 101 0
13 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 324 0
14 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 261 0
15 V* V1249 Cen TT* 12 15 30.7203201048 -39 48 42.606684144   13.09 11.160 10.919 9.50 M0.5 100 0
16 PM J19560-3207 PM* 19 56 04.3718230416 -32 07 37.672684032   12.95 11.589 11.196 10.12 K9IVe 48 0
17 V* AU Mic LM* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1013 0
18 V* WW PsA BY* 22 44 57.9628374984 -33 15 01.744541676 14.583 13.627 12.111 10.916 9.109 M4IVe 106 1
19 V* TX PsA Er* 22 45 00.0641595504 -33 15 26.091533124   14.93 13.36 12.095 10.379 M5IVe 71 0
20 HD 217987 PM* 23 05 52.0357857091 -35 51 11.055185039   8.83 7.39     M2V 245 0
21 HD 218396b Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 247 1
22 HD 218396e Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 172 1
23 HD 218396d Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 214 1
24 HD 218396c Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 233 1
25 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1031 0
26 BPM 82931 Er* 23 32 30.8611320024 -12 15 51.462942408   12.38 10.639 10.320 8.646 M0Ve 64 0

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2022.08.18-04:44:08

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