scholarly journals Multifilter Observations of the Complex Periodic Variations in the M-dwarf Star RIK 90

2021 ◽  
Vol 162 (1) ◽  
pp. 2
Author(s):  
Chris Koen
Keyword(s):  
Dwarf Star ◽  
M Dwarf

scholarly journals A Hot Ultraviolet Flare on the M Dwarf Star GJ 674

2019 ◽  
Vol 871 (2) ◽  
pp. L26 ◽  
Author(s):  
Cynthia S. Froning ◽  
Adam Kowalski ◽  
Kevin France ◽  
R. O. Parke Loyd ◽  
P. Christian Schneider ◽  
...  
Keyword(s):  
Dwarf Star ◽  
M Dwarf

scholarly journals Atmospheric dynamics on tidally locked Earth-like planets in the habitable zone of an M dwarf star

2013 ◽  
Vol 8 (S299) ◽  
pp. 376-377 ◽  
Author(s):  
Ludmila Carone ◽  
Rony Keppens ◽  
Leen Decin
Keyword(s):  
Atmospheric Circulation ◽  
Large Scale ◽  
Rotation Period ◽  
Circulation Model ◽  
Return Flow ◽  
Parameter Study ◽  
Global Circulation Model ◽  
Dwarf Star ◽  
Global Circulation ◽  
M Dwarf

AbstractWe investigated the large scale atmospheric circulation of Gl581g, a potentially habitable planet around an M dwarf star, using an idealized dry global circulation model (GCM) with simplified thermal forcing as a first step towards a systematic extended parameter study. The results are compared with the work of Joshi et al. (1997) who investigated a tidally-locked habitable Earth analogue with less than half the rotation period of Gl581g. The extent, form and strength of the atmospheric circulation in each model generally agree with each other, even though the models differ in key parameters such as planetary radius, surface gravity, forcing scheme and rotation period. The substellar point is associated with an uprising direct circulation-branch of a Hadley-like cell with return flow over the poles. It is compelling to assume that the substellar point of a tidally locked terrestrial exoplanet behaves dynamically like the Earth's tropic associated with clouds and precipitation, making it an ideal target for habitability.

High-latitude SPOT and plage activity on the rapidly rotating M dwarf star Gliese 890

1990 ◽  
Vol 349 ◽  
pp. 608 ◽  
Author(s):  
Arthur Young ◽  
Andrew Skumanich ◽  
Keith B. MacGregor ◽  
Scott Temple
Keyword(s):  
High Latitude ◽  
Dwarf Star ◽  
M Dwarf

Biomarker Response to Galactic Cosmic Ray-Induced NOx And The Methane Greenhouse Effect in The Atmosphere of An Earth-Like Planet Orbiting An M Dwarf Star

Astrobiology ◽  
2007 ◽  
Vol 7 (1) ◽  
pp. 208-221 ◽  
Author(s):  
John Lee Grenfell ◽  
Jean-Mathias Grießmeier ◽  
Beate Patzer ◽  
Heike Rauer ◽  
Antigona Segura ◽  
...  
Keyword(s):  
Greenhouse Effect ◽  
Cosmic Ray ◽  
Dwarf Star ◽  
Biomarker Response ◽  
Galactic Cosmic Ray ◽  
M Dwarf

scholarly journals Short-duration high-amplitude flares detected on the M dwarf star KIC 5474065

2013 ◽  
Vol 434 (3) ◽  
pp. 2451-2457 ◽  
Author(s):  
Gavin Ramsay ◽  
J. Gerry Doyle ◽  
Pasi Hakala ◽  
David Garcia-Alvarez ◽  
Adam Brooks ◽  
...  
Keyword(s):  
Short Duration ◽  
High Amplitude ◽  
Dwarf Star ◽  
M Dwarf

scholarly journals An M-dwarf star in the transition disk of Herbig HD 142527

2016 ◽  
Vol 590 ◽  
pp. A90 ◽  
Author(s):  
S. Lacour ◽  
B. Biller ◽  
A. Cheetham ◽  
A. Greenbaum ◽  
T. Pearce ◽  
...  
Keyword(s):  
Dwarf Star ◽  
M Dwarf

Infrared Photometric Systems, Standards and Variability

1993 ◽  
Vol 136 ◽  
pp. 66-72 ◽  
Author(s):  
S.K. Leggett ◽  
J.A. Smith ◽  
T.D. Oswalt
Keyword(s):  
Photometric System ◽  
Infrared Photometry ◽  
Dwarf Star ◽  
Infrared Arrays ◽  
Instrumental System ◽  
Definition Of ◽  
M Dwarf

AbstractThe accuracy with which infrared photometry can be carried out is currently limited by poor definition of the instrumental system and by the accuracy of the available standard stars. We present new colour transformations between the CIT J, H, K photometric system and systems currently in use at Cerro Tololo, Mauna Kea and Kitt Peak. The precision of the J, H, K data for some of the stars observed by Elias et al. is improved and the system extended to fainter stars suitable for use with larger telescopes and/or infrared arrays. Evidence of infrared variability has been detected for one M dwarf star in our programme.

scholarly journals NGTS and WASP photometric recovery of a single-transit candidate from TESS

2019 ◽  
Author(s):  
Samuel Gill ◽  
Daniel Bayliss ◽  
Benjamin F Cooke ◽  
Peter J Wheatley ◽  
Louise D Nielsen ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Stellar Evolution ◽  
Orbital Period ◽  
Eclipsing Binaries ◽  
Dwarf Star ◽  
Velocity Measurements ◽  
Eclipsing Binary ◽  
Long Period ◽  
M Dwarf

Abstract The Transiting Exoplanet Survey Satellite (TESS) produces a large number of single-transit event candidates, since the mission monitors most stars for only ∼27 days. Such candidates correspond to long-period planets or eclipsing binaries. Using the TESS Sector 1 full-frame images, we identified a 7750 ppm single-transit event with a duration of 7 hours around the moderately evolved F-dwarf star TIC-238855958 (Tmag=10.23, Teff=6280±85 K). Using archival WASP photometry we constrained the true orbital period to one of three possible values. We detected a subsequent transit-event with NGTS, which revealed the orbital period to be 38.20 d. Radial velocity measurements from the CORALIE Spectrograph show the secondary object has a mass of M2= 0.148 ± 0.003 M⊙, indicating this system is an F-M eclipsing binary. The radius of the M-dwarf companion is R2 = 0.171 ± 0.003 R⊙, making this one of the most well characterised stars in this mass regime. We find that its radius is 2.3-σ lower than expected from stellar evolution models.

scholarly journals HATS-6b: A WARM SATURN TRANSITING AN EARLY M DWARF STAR, AND A SET OF EMPIRICAL RELATIONS FOR CHARACTERIZING K AND M DWARF PLANET HOSTS

2015 ◽  
Vol 149 (5) ◽  
pp. 166 ◽  
Author(s):  
J. D. Hartman ◽  
D. Bayliss ◽  
R. Brahm ◽  
G. Á. Bakos ◽  
L. Mancini ◽  
...  
Keyword(s):  
Dwarf Star ◽  
Empirical Relations ◽  
M Dwarf

scholarly journals Turbulent Sound Generation in Red Dwarf Stars

1983 ◽  
Vol 71 ◽  
pp. 605-608
Author(s):  
H.U. Bonn
Keyword(s):  
Current Model ◽  
Solar Chromosphere ◽  
Sound Generation ◽  
Dwarf Star ◽  
Dwarf Stars ◽  
Model Calculations ◽  
Red Dwarf Stars

Since the acoustic heating theory (c.f. Ulmschneider 1979) has been proven successful for the solar chromosphere, it was common practice to extend this concept to other stars. However, as it appeares from observed chromospheric and coronal emissions, the usual theoretical acoustic fluxes for red dwarf star, particularly, are too small to account for the heating of chromospheres and coronae (e.g. Blanco et al 1974; Vaiana et al, 198l) . It is therefore the intention of this paper to discuss improvements on the current model calculations for turbulent sound generation from outer convection zones.

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