The disk-bearing young star IM Lup
H. M. Guenther, S. P. Matt, J. H. M. M. Schmitt, M. Guedel, Z.-Y. Li, and D. M. Burton

TL;DR
This study investigates the X-ray and optical properties of the disk-bearing star IM Lup to determine if its features resemble accreting young stars or more evolved ones, providing insights into star-disk interactions.
Contribution
It provides the first detailed X-ray and optical analysis of IM Lup, a transition object, to assess whether its signatures are due to accretion or disk presence.
Findings
IM Lup has a bright, hot corona with low first-ionisation potential elements depleted.
He-like Ne IX triplet indicates low-density plasma, but high-density scenario not excluded.
X-ray properties resemble main-sequence stars but also show some CTTS signatures.
Abstract
Classical T Tauri stars (CTTS) differ in their X-ray signatures from older pre-main sequence stars, e.g. weak-lined TTS (WTTS). CTTS show a soft excess and deviations from the low-density coronal limit in the He-like triplets. We test whether these features correlate with accretion or the presence of a disk by observing IM Lup, a disk-bearing object apparently in transition between CTTS and WTTS without obvious accretion. We analyse a Chandra grating spectrum and additional XMM-Newton data of IM Lup and accompanying optical spectra, some of them taken simultaneously to the X-ray observations. We fit the X-ray emission lines and decompose the Ha emission line in different components. In X-rays IM Lup has a bright and hot active corona, where elements of low first-ionisation potential are depleted. The He-like Ne IX triplet is in the low-density state, but due to the small number of…
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