2008A&A...484..281N


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET09:11:55

2008A&A...484..281N - Astronomy and Astrophysics, volume 484, 281-291 (2008/6-2)

Astrometric and photometric monitoring of GQ Lupi and its sub-stellar companion.

NEUHAEUSER R., MUGRAUER M., SEIFAHRT A., SCHMIDT T.O.B. and VOGT N.

Abstract (from CDS):

Neuhaeuser et al. (2005A&A...435L..13N) presented direct imaging evidence for a sub-stellar companion to the young T Tauri star GQ Lupi. Common proper motion was highly significant, but no orbital motion was detected. Faint luminosity, low gravity, and a late-M/early-L spectral type indicated that the companion is either a planet or a brown dwarf. We have monitored GQ Lupi and its companion in order to detect orbital and parallactic motion and variability in its brightness. We also search for closer and fainter companions. We have taken six more images with the VLT Adaptive Optics instrument NACO from May 2005 to Feb. 2007, always with the same calibration binary from Hipparcos for both astrometric and photometric calibration. By adding up all the images taken so far, we search for additional companions. The position of GQ Lupi A and its companion compared to a nearby non-moving background object varies as expected for parallactic motion by about one pixel (2xπ with parallax π). We could not find evidence for variability of the GQ Lupi companion in the Ks-band (standard deviation being ±0.08mag), which may be due to large error bars. No additional companions are found with deep imaging. There is now exceedingly high significance for common proper motion of GQ Lupi A and its companion. In addition, we see for the first time an indication for orbital motion (∼2 to 3mas/yr decrease in separation, but no significant change in the position angle), consistent with a near edge-on or highly eccentric orbit. We measured the parallax for GQ Lupi A to be π=6.4±1.9mas (i.e. 156±50pc) and for the GQ Lupi companion to be 7.2±2.1mas (i.e. 139±45pc), both consistent with being in the Lupus I cloud and bound to each other.

Abstract Copyright:

Journal keyword(s): astrometry - stars: binaries: visual - stars: distances - stars: formation - stars: individual: GQ Lupi - stars: pre-main sequence

Simbad objects: 8

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Number of rows : 8

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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3614 0
2 V* V2384 Ori Al* 05 35 21.8463185314 -05 46 08.560286991       19.21 17.28 M7 91 1
3 HD 132347B * 14 59 28.9794458836 -30 42 33.713412842   9.64 9.22 9.56   ~ 3 0
4 HD 132347 ** 14 59 29.23211 -30 42 41.5076           A3mA5-F0 22 0
5 NAME Lupus I Cld 15 43 02.1 -34 09 06           ~ 235 0
6 USNO-B1.0 0543-00373323 * 15 49 11.7447792162 -35 39 00.474041857   19.3   17.8   ~ 1 0
7 CD-35 10525 Or* 15 49 12.1055573607 -35 39 05.053991067 12.19 12.76 11.66 11.15   K7Ve 252 0
8 2MASS J15491331-3539118 LM* 15 49 13.3081131346 -35 39 11.790418380           ~ 102 0

    Equat.    Gal    SGal    Ecl

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2021.02.26-09:11:55

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