2014
DOI: 10.1051/0004-6361/201323128
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Exocomets in the circumstellar gas disk of HD 172555

Abstract: 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 Ca II 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 prod… Show more

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Cited by 64 publications
(70 citation statements)
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“…It could in particular first be applied to some systems where falling evaporating bodies (FEBs) are known, such as β Pictoris or HD 172555 (Beust et al 1998;Kiefer et al 2014). It could also be tried on systems where interferometric observations seem to show the presence of hot dust called exozodis (Absil et al 2013;Ertel et al 2015).…”
Section: Discussionmentioning
confidence: 99%
“…It could in particular first be applied to some systems where falling evaporating bodies (FEBs) are known, such as β Pictoris or HD 172555 (Beust et al 1998;Kiefer et al 2014). It could also be tried on systems where interferometric observations seem to show the presence of hot dust called exozodis (Absil et al 2013;Ertel et al 2015).…”
Section: Discussionmentioning
confidence: 99%
“…The 2.3 km s −1 wide line at V LSR =−22 km s −1 arises in the interstellar medium (see, e.g., Kiefer et al 2014), so is not related to gas in the disk associated with HD 172555. Although weak, the radial velocity is in agreement with the value for the interstellar atomic lines found by Kiefer et al (2014).…”
Section: Discussionmentioning
confidence: 99%
“…This should have a V LSR =1 km s −1 and an FWHP of 33 km s −1 (Gontcharov 2006; Kiefer et al 2014). Qualitatively, from a perusal of Figure 1, no line seems to be present above the noise at this relative velocity.…”
Section: The Apex Datamentioning
confidence: 95%
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