http://arxiv.org/abs/2209.11314
JWST will be able to observe the atmospheres of rocky planets transiting nearby M dwarfs. The M dwarf triple star system LTT 1445, at a distance of 6.86 pc, hosts some of the nearest rocky terrestrial planets. These planets most likely orbit the M 3.5V star LTT 1445A. During a 28.6 ksec Chandra ACIS-S3 observation we have i) spatially resolved and detected all three stars in the LTT 1445 system, ii) measured the X-ray luminosity of the individual stars, including LTT 1445A, for the first time, iii) studied the flux variability of the X-ray sources and found strong variability from the A and C components, and iv) investigated how the coronal luminosities, temperatures and volume emission measures vary at different activity levels. Combining these X-ray data with upcoming HST ultraviolet observations will allow a differential emission measure (DEM) estimation of the star’s EUV spectrum, thereby facilitating modeling of the rocky planets’ atmospheres.
A. Brown, C. Froning, A. Youngblood, et. al.
Mon, 26 Sep 22
22/62
Comments: 18 pages, 4 figures. Accepted to The Astronomical Journal (2022 September 1)
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