Advanced

Exocomet signatures around the A-shell star φ Leonis?

Eiroa, C.; Rebollido, I.; Montesinos, B.; Villaver, E.; Absil, O.; Henning, Th; Bayo, A.; Canovas, H.; Carmona, A. and Chen, Ch, et al. (2016) In Astronomy and Astrophysics 594.
Abstract

We present an intensive monitoring of high-resolution spectra of the Ca ii 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... (More)

We present an intensive monitoring of high-resolution spectra of the Ca ii 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.

(Less)
Please use this url to cite or link to this publication:
author
, et al. (More)
(Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Circumstellar matter, Comets: general, Planetary systems, Stars: individual: φLeo
in
Astronomy and Astrophysics
volume
594
publisher
EDP Sciences
external identifiers
  • scopus:84991227111
  • wos:000385832200125
ISSN
0004-6361
DOI
10.1051/0004-6361/201629514
language
English
LU publication?
yes
id
07a90a88-24ae-42eb-a76b-54b50ac4c755
date added to LUP
2016-11-02 11:26:29
date last changed
2017-11-19 04:34:27
@article{07a90a88-24ae-42eb-a76b-54b50ac4c755,
  abstract     = {<p>We present an intensive monitoring of high-resolution spectra of the Ca ii 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.</p>},
  articleno    = {L1},
  author       = {Eiroa, C. and Rebollido, I. and Montesinos, B. and Villaver, E. and Absil, O. and Henning, Th and Bayo, A. and Canovas, H. and Carmona, A. and Chen, Ch and Ertel, S. and Iglesias, D. P. and Launhardt, R. and Maldonado, J. and Meeus, G. and Moór, A. and Mora, A. and Mustill, A. J. and Olofsson, J. and Riviere-Marichalar, P. and Roberge, A.},
  issn         = {0004-6361},
  keyword      = {Circumstellar matter,Comets: general,Planetary systems,Stars: individual: φLeo},
  language     = {eng},
  month        = {10},
  publisher    = {EDP Sciences},
  series       = {Astronomy and Astrophysics},
  title        = {Exocomet signatures around the A-shell star φ Leonis?},
  url          = {http://dx.doi.org/10.1051/0004-6361/201629514},
  volume       = {594},
  year         = {2016},
}