2010A&A...522A...2B


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET19:14:50

2010A&A...522A...2B - Astronomy and Astrophysics, volume 522, A2-2 (2010/11-1)

Searching for the sub-stellar companions in the LkCa 15 proto-planetary disk.

BONAVITA M., CHAUVIN G., BOCCALETTI A., PIETU V., BAUDOZ P., BEUZIT J.L., DUTREY A., GUILLOTEAU S., LAGRANGE A.M., MOUILLET D. and NICCOLINI G.

Abstract (from CDS):

Recent sub-millimetric observations at the Plateau de Bure interferometer showed a cavity of ∼46AU in radius in the proto-planetary disk of the T Tauri star LkCa15 (V1079 Tau), located in the Taurus molecular cloud. Additional Spitzer observations have corroborated this result which can possibly be explained by a massive (≥5MJup) planetary companion, a brown dwarf or a low-mass star companion at about 30AU from the star. We used the most recent developments of high angular resolution and high-contrast imaging to directly search for this putative companion, and to bring new constraints on its physical and orbital properties. The NACO adaptive optics instrument at the VLT was used to observe LkCa15 with a four-quadrant phase-mask coronagraph to access small angular separations at relatively high contrast. A reference star at the same parallactic angle was carefully observed to optimize the quasi-static speckles subtraction (limiting our sensitivity by less than 1.0''). Although we do not report any positive detection of a faint companion that would be responsible for the observed gap in LkCa15's disk (25-30AU), our detection limits start constraining its probable mass, semi-major axis and eccentricity. Using evolutionary model predictions, the Monte Carlo simulations exclude the presence of low eccentric companions with masses M≥6MJup and orbiting at a≥100AU with a significant level of confidence. For closer orbits, brown dwarf companions can be rejected with a detection probability of 90% down to 80AU (at 80% down to 60AU). Our detection limits do not permit us to access the star environment close enough to fully exclude the presence of a brown dwarf or a massive planet within the disk's inner activity (i.e. at less than 30AU). Only, further and higher contrast observations should unveil the existence of this putative companion inside the LkCa15 disk.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - protoplanetary disks - instrumentation: adaptive optics

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Auriga reg 04 20 00.0 +38 05 00           ~ 174 0
2 EM* LkCa 15 Or* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 568 1
3 BD+22 729 * 04 40 49.2815516292 +22 21 11.033756348   11.84 10.85     K0III 2 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3577 0
5 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 944 2
6 HD 31648 Ae* 04 58 46.2654165113 +29 50 36.990341242 7.84 7.78 7.62 7.76 7.43 A5Vep 404 0
7 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1679 1
8 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1571 1
9 HD 141569 pr* 15 49 57.7484743862 -03 55 16.344023102 7.22 7.20 7.12 7.00 7.04 A2VekB9mB9(_lB) 476 0
10 * 51 Peg Ro* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1080 1
11 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1129 3
12 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 916 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-19:14:50

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