X-Ray Emission from the Exoplanet Hosting LTT 1445 Triple Star System

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 ks Chandra ACIS-S...

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Bibliographic Details
Published in:The Astronomical journal 2022-11, Vol.164 (5), p.206
Main Authors: Brown, Alexander, Froning, Cynthia S., Youngblood, Allison, France, Kevin, Wilson, David J., Duvvuri, Girish, Miguel, Yamila, Diamond-Lowe, Hannah
Format: Article
Language:English
Subjects:
Astronomy
Atmosphere
Emission analysis
Emission measurements
Extrasolar planets
Luminosity
M dwarf stars
Planet hosting stars
Planetary atmospheres
Planetary orbits
Red dwarf stars
Stellar X-ray flares
Terrestrial planets
Triple stars
Ultraviolet spectra
X ray sources
X-ray emissions
X-rays
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Summary: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 ks 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 estimation of the star’s extreme-ultraviolet spectrum, thereby facilitating modeling of the rocky planets’ atmospheres.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ac8f25