2018A&A...613L...6S


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.29CET22:34:27

2018A&A...613L...6S - Astronomy and Astrophysics, volume 613, L6-6 (2018/5-1)

New disk discovered with VLT/SPHERE around the M star GSC 07396-00759.

SISSA E., OLOFSSON J., VIGAN A., AUGEREAU J.C., D'ORAZI V., DESIDERA S., GRATTON R., LANGLOIS M., RIGLIACO E., BOCCALETTI A., KRAL Q., LAZZONI C., MESA D., MESSINA S., SEZESTRE E., THEBAULT P., ZURLO A., BHOWMIK T., BONNEFOY M., CHAUVIN G., FELDT M., HAGELBERG J., LAGRANGE A.-M., JANSON M., MAIRE A.-L., MENARD F., SCHLIEDER J., SCHMIDT T., SZULAGYI J., STADLER E., MAUREL D., DELBOULBE A., FEAUTRIER P., RAMOS J. and RIGAL F.

Abstract (from CDS):

Debris disks are usually detected through the infrared excess over the photospheric level of their host star. The most favorable stars for disk detection are those with spectral types between A and K, while the statistics for debris disks detected around low-mass M-type stars is very low, either because they are rare or because they are more difficult to detect. Terrestrial planets, on the other hand, may be common around M-type stars. Here, we report on the discovery of an extended (likely) debris disk around the M-dwarf GSC 07396-00759. The star is a wide companion of the close accreting binary V4046 Sgr. The system probably is a member of the β Pictoris Moving Group. We resolve the disk in scattered light, exploiting high-contrast, high-resolution imagery with the two near-infrared subsystems of the VLT/SPHERE instrument, operating in the Y J bands and the H2H3 doublet. The disk is clearly detected up to 1.5" (∼110au) from the star and appears as a ring, with an inclination i∼83°, and a peak density position at ∼70au. The spatial extension of the disk suggests that the dust dynamics is affected by a strong stellar wind, showing similarities with the AU Mic system that has also been resolved with SPHERE. The images show faint asymmetric structures at the widest separation in the northwest side. We also set an upper limit for the presence of giant planets to 2MJ. Finally, we note that the 2 resolved disks around M-type stars of 30 such stars observed with SPHERE are viewed close to edge-on, suggesting that a significant population of debris disks around M dwarfs could remain undetected because of an unfavorable orientation.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: individual: GSC 07396-00759 - techniques: high angular resolution - protoplanetary disks

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 - 2020
#notes
1 V* CE Ant TT* 10 42 30.1021269333 -33 40 16.226774953   12.21 10.91   9.10 M2Ve 147 1
2 NAME TW Hya Association As* 11 01.9 -34 42           ~ 802 0
3 V* V1249 Cen TT* 12 15 30.7203284919 -39 48 42.605543199   13.09 11.160 10.919 9.50 M0.5 82 0
4 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 542 1
5 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 534 0
6 BD-07 4003 BY* 15 19 26.8271336166 -07 43 20.190958776 13.403 11.76 10.560 9.461 8.911 M3V 525 2
7 HD 141569 pr* 15 49 57.7484743862 -03 55 16.344023102 7.22 7.20 7.12 7.00 7.04 A2VekB9mB9(_lB) 461 0
8 HD 319139 BY* 18 14 10.4818974563 -32 47 34.516106830   11.47 10.68   9.11 K5+K7 280 0
9 GSC 07396-00759 Em* 18 14 22.0738917529 -32 46 10.133784566   14.14 12.78 12.13 10.380 M1Ve 31 0
10 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 881 0

    Equat.    Gal    SGal    Ecl

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2020.01.29-22:34:27

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