2019A&A...631A..84M


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.22CET18:28:33

2019A&A...631A..84M - Astronomy and Astrophysics, volume 631A, 84-84 (2019/11-1)

Detection of Hα emission from PZ Telescopii B using SPHERE/ZIMPOL.

MUSSO BARCUCCI A., CUGNO G., LAUNHARDT R., MULLER A., SZULAGYI J., VAN BOEKEL R., HENNING T., BONNEFOY M. and QUANZ S.P.

Abstract (from CDS):

Hα is a powerful tracer of accretion and chromospheric activity, which has been detected in the case of young brown dwarfs and even recently in planetary mass companions (e.g. PDS70 b and c). Hα detections and characterisation of brown dwarf and planet companions can further our knowledge of their formation and evolution, and expanding such a sample is therefore our primary goal. We used the Zurich Imaging POLarimeter (ZIMPOL) of the SPHERE instrument at the Very Large Telescope (VLT) to observe the known 38-72MJ companion orbiting PZ Tel, obtaining simultaneous angular differential imaging observations in both continuum and narrow Hα band. We detect Hα emission from the companion, making this only the second Hα detection of a companion using the SPHERE instrument. We used our newly added astrometric measurements to update the orbital analysis of PZ Tel B, and we used our photometric measurements to evaluate the Hα line flux. Given the estimated bolometric luminosity, we obtained an Hα activity (log(L/Lbol)) between -4.16 and -4.31. The Hα activity of PZ Tel B is consistent with known average activity levels for M dwarf of the same spectral type. Given the absence of a known gaseous disk and the relatively old age of the system (24Myr), we conclude that the Hα emission around PZ Tel B is likely due to chromospheric activity.

Abstract Copyright: © A. M. Barcucci et al. 2019

Journal keyword(s): instrumentation: high angular resolution - methods: observational - stars: activity - stars: individual: PZ Tel - stars: imaging

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 NAME DH Tau B BD* 04 29 41.66 +26 32 56.5           M9.25 52 3
2 EM* LkCa 15 TT* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 536 1
3 PDS 70b Pl? 14 08 10.1545137760 -41 23 52.576649494           ~ 29 0
4 PDS 70c Pl? 14 08 10.1545137760 -41 23 52.576649494           ~ 8 0
5 2MASS J15491331-3539118 BD* 15 49 13.3081131346 -35 39 11.790418380           L1.5 95 0
6 HD 142527b Pl? 15 56 41.8888096574 -42 19 23.245384377           ~ 15 0
7 NAME Upper Sco Association As* 16 12 -23.4           ~ 976 1
8 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 240 0
9 NAME PZ Tel B PM* 18 53 05.8743 -50 10 49.880           M7+2 59 0
10 NAME PZ Tel A * 18 53 05.8743 -50 10 49.880           K0 13 0

    Equat.    Gal    SGal    Ecl

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2020.02.22-18:28:33

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