2016A&A...594L...1E


Query : 2016A&A...594L...1E

2016A&A...594L...1E - Astronomy and Astrophysics, volume 594, L1-1 (2016/10-1)

Exocomet signatures around the A-shell star φ Leonis?

EIROA C., REBOLLIDO I., MONTESINOS B., VILLAVER E., ABSIL O., HENNING T., BAYO A., CANOVAS H., CARMONA A., CHEN C., ERTEL S., IGLESIAS D.P., LAUNHARDT R., MALDONADO J., MEEUS G., MOOR A., MORA A., MUSTILL A.J., OLOFSSON J., RIVIERE-MARICHALAR P. and ROBERGE A.

Abstract (from CDS):

We present an intensive monitoring of high-resolution spectra of the CaII K line in the A7IV shell star φ Leo at very short (minutes, hours), short (night to night), and medium (weeks, months) timescales. The spectra show remarkable variable absorptions on timescales of hours, days, and months. The characteristics of these sporadic events are very similar to most that are observed toward the debris disk host star β Pic, which are commonly interpreted as signs of the evaporation of solid, comet-like bodies grazing or falling onto the star. Therefore, our results suggest the presence of solid bodies around φ Leo. To our knowledge, with the exception of β Pic, our monitoring has the best time resolution at the mentioned timescales for a star with events attributed to exocomets. Assuming the cometary scenario and considering the timescales of our monitoring, our results indicate that φ Leo presents the richest environment with comet-like events known to date, second only to β Pic.

Abstract Copyright: © ESO, 2016

Journal keyword(s): planetary systems - stars: individual: φ Leo - comets: general - circumstellar matter

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 256 ** 00 07 18.2658367200 -17 23 13.173158760   6.311 6.203 7.36   A3Vn_sh 105 0
2 * 49 Cet PM* 01 34 37.7786780856 -15 40 34.898673000   5.667 5.607   5.54 A1V 277 0
3 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1808 1
4 * phi Leo PM* 11 16 39.6995972 -03 39 05.777018   4.654 4.450     A5V 122 0
5 HD 172555 PM* 18 45 26.9009806435 -64 52 16.534807985   4.967 4.767     A7V 261 0
6 NAME Leo Cloud Cld ~ ~           ~ 58 0

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2022.12.05-18:30:17

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