2014A&A...561L..10K


Query : 2014A&A...561L..10K

2014A&A...561L..10K - Astronomy and Astrophysics, volume 561, L10-10 (2014/1-1)

Exocomets in the circumstellar gas disk of HD 172555.

KIEFER F., LECAVELIER DES ETANGS A., AUGEREAU J.-C., VIDAL-MADJAR A., LAGRANGE A.-M. and BEUST H.

Abstract (from CDS):

The source HD 172555 is a young A7V star surrounded by a debris disk with a gaseous component. Here, we present the detection of variable absorption features detected simultaneously in the CaII K and H doublet lines (at λ3933 Å and λ3968 Å). We identified the presence of these absorption signatures at four different epochs in the 129 HARPS high-resolution spectra gathered between 2004 and 2011. These transient absorption features are most likely due to falling evaporating bodies (FEBs, or exocomets) that produce absorbing gas observed transiting in front of the central star. We also detect a stable CaII absorption component at the star's radial velocity. With no corresponding detection in the NaI line, the resulting very low upper limit for the NaI/CaII ratio suggests that this absorption is due to circumstellar gas.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual: HD 172555 - comets: general - circumstellar matter - ISM: clouds

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 256 ** 00 07 18.2658367200 -17 23 13.173158760   6.311 6.203 7.36   A3Vn_sh 108 0
2 NAME G Cloud Cld 03 00 +50.2           ~ 73 0
3 HD 21620 EB* 03 31 29.3403535800 +49 12 35.181649440 6.390 6.350 6.280     A0Vn 65 0
4 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1908 1
5 HD 42111 * 06 08 57.9037271424 +02 29 58.885200456 5.86 5.80 5.73     B9V 125 0
6 * rho Vir dS* 12 41 53.0569475088 +10 14 08.252569320 5.00 4.97 4.88 4.80 4.78 A0Va_lB 224 0
7 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 777 0
8 HD 145964 * 16 14 28.8827284680 -21 06 27.491575572   6.407 6.405     B9V 85 0
9 HD 172555 PM* 18 45 26.9009806435 -64 52 16.534807985   4.967 4.767     A7V 278 0

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