scholarly journals An X‐Ray Census of Young Stars in the Chamaeleon I North Cloud

2004 ◽  
Vol 614 (1) ◽  
pp. 267-283 ◽  
Author(s):  
Eric D. Feigelson ◽  
Warrick A. Lawson
Keyword(s):  
Young Stars ◽  
X Ray

scholarly journals X‐Ray and Infrared Observations of Embedded Young Stars in NGC 2264

2005 ◽  
Vol 618 (2) ◽  
pp. 795-809 ◽  
Author(s):  
Theodore Simon ◽  
S. E. Dahm
Keyword(s):  
Young Stars ◽  
Infrared Observations ◽  
X Ray

OPTICAL SPECTROSCOPY OF X-RAY-SELECTED YOUNG STARS IN THE CARINA NEBULA

2015 ◽  
Vol 150 (6) ◽  
pp. 195 ◽  
Author(s):  
Kaushar Vaidya ◽  
Wen-Ping Chen ◽  
Hsu-Tai Lee
Keyword(s):  
Optical Spectroscopy ◽  
Young Stars ◽  
X Ray ◽  
Carina Nebula

scholarly journals Bright X‐Ray Flares in Orion Young Stars from COUP: Evidence for Star‐Disk Magnetic Fields?

2005 ◽  
Vol 160 (2) ◽  
pp. 469-502 ◽  
Author(s):  
F. Favata ◽  
E. Flaccomio ◽  
F. Reale ◽  
G. Micela ◽  
S. Sciortino ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Young Stars ◽  
X Ray

Implications of stellar activity for exoplanetary atmospheres

2010 ◽  
Vol 9 (4) ◽  
pp. 239-243 ◽  
Author(s):  
P. Odert ◽  
M. Leitzinger ◽  
A. Hanslmeier ◽  
H. Lammer ◽  
M.L. Khodachenko ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Planetary Atmospheres ◽  
Young Star ◽  
Young Stars ◽  
M Dwarfs ◽  
Low Mass Stars ◽  
X Ray ◽  
History Of ◽  
Low Mass ◽  
Exoplanetary Atmospheres

AbstractStellar X-ray and extreme ultraviolet (XUV) radiation is an important driver of the escape of planetary atmospheres. Young stars emit high XUV fluxes that decrease as they age. Since the XUV emission of a young star can be orders of magnitude higher compared to an older one, this evolution has to be taken into account when studying the mass-loss history of a planet. The temporal decrease of activity is closely related to the operating magnetic dynamo, which depends on rotation and convection in Sun-like stars. Using a sample of nearby M dwarfs, we study the relations between age, rotation and activity and discuss the influence on planets orbiting these low-mass stars.

X-Ray Observations of Young Stars Address a Puzzle of the Solar System’s Origin

Physics Today ◽  
2001 ◽  
Vol 54 (11) ◽  
pp. 19-21
Author(s):  
Bertram Schwarzschild
Keyword(s):  
Young Stars ◽  
X Ray

scholarly journals Special Session 7 Young Stars, Brown Dwarfs, and Protoplanetary Disks

2009 ◽  
Vol 5 (H15) ◽  
pp. 727-728
Author(s):  
Jane Gregorio-Hetem ◽  
Silvia Alencar
Keyword(s):  
Adaptive Optics ◽  
Planet Formation ◽  
Protoplanetary Disks ◽  
Brown Dwarfs ◽  
Young Stars ◽  
Special Session ◽  
Brown Dwarf ◽  
X Ray ◽  
Substellar Objects

In recent years our knowledge of star, brown dwarf and planet formation has progressed immensely due to new data in the IR domain (Spitzer telescope), new X-ray campaigns such as the Chandra Orion Ultradeep Project (COUP) and the X-ray Emission Survey of Taurus (XEST), with XMM-Newton, as well as adaptive optics results and synoptic studies of young stellar and substellar objects.

scholarly journals X-ray irradiation and evaporation of the four young planets around V1298 Tau

2020 ◽  
Vol 500 (4) ◽  
pp. 4560-4572
Author(s):  
K Poppenhaeger ◽  
L Ketzer ◽  
M Mallonn
Keyword(s):  
Mass Loss ◽  
High Energy ◽  
Magnetic Activity ◽  
Young Star ◽  
Young Stars ◽  
X Ray ◽  
Energy Irradiation ◽  
Irradiation Level ◽  
Host Stars ◽  
Gaseous Envelopes

ABSTRACT Planets around young stars are thought to undergo atmospheric evaporation due to the high magnetic activity of the host stars. Here we report on X-ray observations of V1298 Tau, a young star with four transiting exoplanets. We use X-ray observations of the host star with Chandra and ROSAT to measure the current high-energy irradiation level of the planets and employ a model for the stellar activity evolution together with exoplanetary mass-loss to estimate the possible evolution of the planets. We find that V1298 Tau is X-ray bright with log LX [erg s−1] = 30.1 and has a mean coronal temperature of ≈9 MK. This places the star amongst the more X-ray luminous ones at this stellar age. We estimate the radiation-driven mass-loss of the exoplanets and find that it depends sensitively on the possible evolutionary spin-down tracks of the star as well as on the current planetary densities. Assuming the planets are of low density due to their youth, we find that the innermost two planets can lose significant parts of their gaseous envelopes and could be evaporated down to their rocky cores depending on the stellar spin evolution. However, if the planets are heavier and follow the mass–radius relation of older planets, then even in the highest XUV irradiation scenario none of the planets is expected to cross the radius gap into the rocky regime until the system reaches an age of 5 Gyr.

scholarly journals X-ray spectroscopy evidence for plasma shell formation in experiments modeling accretion columns in young stars

2019 ◽  
Vol 4 (6) ◽  
pp. 064402 ◽  
Author(s):  
E. D. Filippov ◽  
I. Yu. Skobelev ◽  
G. Revet ◽  
S. N. Chen ◽  
B. Khiar ◽  
...  
Keyword(s):  
Young Stars ◽  
Shell Formation ◽  
X Ray ◽  
Plasma Shell

scholarly journals Rotational Modulation of X‐Ray Emission in Orion Nebula Young Stars

2005 ◽  
Vol 160 (2) ◽  
pp. 450-468 ◽  
Author(s):  
E. Flaccomio ◽  
G. Micela ◽  
S. Sciortino ◽  
E. D. Feigelson ◽  
W. Herbst ◽  
...  
Keyword(s):  
Young Stars ◽  
Orion Nebula ◽  
X Ray ◽  
Rotational Modulation

scholarly journals Spectroscopic characterization of X-ray emitting young stars associated with the Sh 2-296 nebula★

2015 ◽  
Vol 448 (1) ◽  
pp. 119-134 ◽  
Author(s):  
B. Fernandes ◽  
J. Gregorio-Hetem ◽  
T. Montmerle ◽  
G. Rojas
Keyword(s):  
Spectroscopic Characterization ◽  
Young Stars ◽  
X Ray
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