|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The MUSCLES Treasury Survey I: Motivation and Overview | | Kevin France
; R. O. Parke Loyd
; Allison Youngblood
; Alexander Brown
; P. Christian Schneider
; Suzanne L. Hawley
; Cynthia S. Froning
; Jeffrey L. Linsky
; Aki Roberge
; Andrea P. Buccino
; James R. A. Davenport
; Juan M. Fontenla
; Lisa Kaltenegger
; Adam F. Kowalski
; Pablo J. D. Mauas
; Yamila Miguel
; Seth Redfield
; Sarah Rugheimer
; Feng Tian
; Lucianne M. Walkowicz
; Kolby L. Weisenburger
; | | Date: |
29 Feb 2016 | | Abstract: | Ground- and space-based planet searches employing radial velocity techniques
and transit photometry have detected thousands of planet-hosting stars in the
Milky Way. The chemistry of these atmospheres is controlled by the shape and
absolute flux of the stellar spectral energy distribution, however, flux
distributions of relatively inactive low-mass stars are poorly known at
present. To better understand exoplanets orbiting low-mass stars, we have
executed a panchromatic (X-ray to mid-IR) study of the spectral energy
distributions of 11 nearby planet hosting stars, the {it Measurements of the
Ultraviolet Spectral Characteristics of Low-mass Exoplanetary Systems}
(MUSCLES) Treasury Survey. The MUSCLES program consists of contemporaneous
observations at X-ray, UV, and optical wavelengths. We show that energetic
radiation (X-ray and ultraviolet) is present from magnetically active stellar
atmospheres at all times for stars as late as M5. Emission line luminosities of
ion{C}{4} and ion{Mg}{2} are strongly correlated with band-integrated
luminosities. We find that while the slope of the spectral energy distribution,
FUV/NUV, increases by approximately two orders of magnitude form early K to
late M dwarfs ($approx$~0.01~to~1), the absolute FUV and XUV flux levels at
their corresponding habitable zone distances are constant to within factors of
a few, spanning the range 10~--~70 erg cm$^{-2}$ s$^{-1}$ in the habitable
zone. Despite the lack of strong stellar activity indicators in their optical
spectra, several of the M dwarfs in our sample show spectacular flare emission
in their UV light curves. Finally, we interpret enhanced $L(line)$/$L_{Bol}$
ratios for ion{C}{4} and ion{N}{5} as tentative observational evidence for
the interaction of planets with large planetary mass-to-orbital distance ratios
($M_{plan}$/$a_{plan}$) with the transition regions of their host stars. | | Source: | arXiv, 1602.9142 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER