Results 71 to 80 of about 250 (146)

Data models, representation and adequacy-for-purpose. [PDF]

Eur J Philos Sci, 2021
Bokulich A, Parker W.
europepmc   +1 more source

Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. III. Comparison between Starspot Mapping, Zeeman Doppler Imaging, and Multiwavelength Variability

The Astrophysical Journal
Recent simultaneous multiwavelength observations of a nearby young solar-type star EK Draconis (EK Dra) in the optical, H α spectrum, and X-ray, have provided evidence for stellar prominence eruptions associated with superflares.
Kai Ikuta, Kosuke Namekata, Pascal Petit, Vladimir S. Airapetian, Hiroyuki Maehara, Yuta Notsu, Aline A. Vidotto, Keith Gendreau, Sandra V. Jeffers, Stephen Marsden, Julien Morin, Coralie Neiner, Rishi R. Paudel, Daisaku Nogami, Kazunari Shibata   +14 more
doaj   +1 more source

Quantifying the Transit Light Source Effect: Measurements of Spot Temperature and Coverage on the Photosphere of AU Microscopii with High-resolution Spectroscopy and Multicolor Photometry

The Astrophysical Journal
AU Microscopii (AU Mic) is an active 24 ± 3 Myr pre-main-sequence M dwarf in the stellar neighborhood ( d = 9.7 pc) with a rotation period of 4.86 days. The two transiting planets orbiting AU Mic, AU Mic b and c, are warm sub-Neptunes on 8.5 and 18.9 day
William C. Waalkes, Zachory K. Berta-Thompson, Elisabeth R. Newton, Andrew W. Mann, Peter Gao, Hannah R. Wakeford, Lili Alderson, Peter Plavchan   +7 more
doaj   +1 more source

Minimizing Star-spot Contamination of Exoplanet Transit Spectroscopy Using Alternate Normalization

The Astronomical Journal
Recently, M. H. Currie et al. (2023) simulated the detection of molecules in the atmospheres of temperate rocky exoplanets transiting nearby M-dwarf stars.
Drake Deming, Miles H. Currie, Victoria S. Meadows, Sarah Peacock   +3 more
doaj   +1 more source

Starspot trek: The motion picture [PDF]

Contributions of the Astronomical Observatory Skalnaté Pleso, 2020
openaire   +1 more source

Coincidence between Rotational Modulations of Coronal and Photospheric Activities on the Saturated Star AB Dor

The Astronomical Journal
The magnetic connection among different layers is observed on the Sun and plays a key role in solar activity. It is also expected to be common on other active stars.
Fu-Kun Xu, Shenghong Gu
doaj   +1 more source

Molecular Hydrogen Controls the Temperatures of Flares on TRAPPIST-1

The Astrophysical Journal Letters
Early JWST observations of TRAPPIST-1 have revealed an unexpected puzzle: energetic white-light flares ( E  > 10 ^30 erg) reach temperatures of only ∼3500–4000 K, nearly 3 times cooler than typical solar flares, which peak around 9000–10,000 K.
A. I. Shapiro, N. Kostogryz, S. Seager, V. Witzke, J. de Wit, V. Vasilyev, Astrid M. Veronig, Cameron Robert, Peter Hardi, S. K. Solanki   +9 more
doaj   +1 more source

Detailed Analysis of Six Contact Binaries and their Possible Origin

The Astronomical Journal
A photometric investigation of six binary systems of the W Ursae Majoris (W UMa)-type is presented. We extracted primary and secondary minima from the Transiting Exoplanet Survey Satellite observations of these systems.
Somayeh Soomandar, Lorne Nelson, Joshua Aiken   +2 more
doaj   +1 more source

A study of pulsation & rotation in a sample of A-K type stars in the Kepler field. [PDF]

Astrophys Space Sci, 2018
Chowdhury S, Joshi S, Engelbrecht CA, De Cat P, Joshi YC, Paul KT.   +5 more
europepmc   +1 more source

Starspots and Flares are Generally Not Correlated

Sunspots and solar flares are two different manifestations of magnetic activity on the surface of the Sun. On the Sun, flares typically occur close to spots. In this paper we test this the connection between spots and flares on other stars. We detect 218,386 stellar flares on 14,163 spotted stars using a new algorithm called \textsc{toffee ...
Zhang, Andy B., Reeves, Jason R., Martin, David V., Pratt, Veronica, Tubthong, Wata, Weinstein, Arielle, Ward, Isabella E.   +6 more
openaire   +2 more sources