Results 1 to 10 of about 1,661 (99)
Starspots as the origin of ultrafast drifting radio bursts from an active M dwarf [PDF]
Sci AdvDetecting coherent radio bursts from nearby M dwarfs provides opportunities for exploring their magnetic activity and interaction with orbiting exoplanets.
Jiale Zhang +18 more
semanticscholar +2 more sources
The connection between starspots and superflares: a case study of two stars [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2023 How do the characteristics of starspots influence the triggering of stellar flares? Here we investigate the activity of two K-type stars, similar in every way from mass to rotation periods and planetary systems. Both stars exhibit about a hundred spots,
Alexandre Araujo
exaly +2 more sources
Modeling the effects of starspots on stellar magnetic cycles [PDF]
Astronomy and AstrophysicsObservations show that faster rotating stars tend to have stronger magnetic activity and shorter magnetic cycles. The cyclical magnetic activity of the Sun and stars is believed to be driven by the dynamo process. The success of the Babcock-Leighton (BL)
Jie Jiang +2 more
exaly +2 more sources
Starspots on WASP-107 and pulsations of WASP-118 [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 By analysing the K2 short-cadence photometry we detect starspot occultation events in the lightcurve of WASP-107, the host star of a warm-Saturn exoplanet. WASP-107 also shows a rotational modulation with a period of 17.5 +/- 1.4 d.
Coel Hellier, John Southworth
exaly +2 more sources
GJ 1214: Rotation period, starspots, and uncertainty on the optical slope of the transmission spectrum [PDF]
Astronomy and Astrophysics, 2018 Aims. Brightness inhomogeneities in the stellar photosphere (dark spots or bright regions) affect the measurements of the planetary transmission spectrum.
Enrique Herrero +2 more
exaly +2 more sources
Probing the magnetic fields of starspots with transit mapping
Astronomy and AstrophysicsStarspots, regions of strong magnetic fields, serve as indicators of stellar activity and the dynamo mechanism at play in the interior of stars. The magnetic fields of main-sequence stars play a crucial role in driving stellar activity.
Alexandre Araujo, Fabian Menezes
exaly +2 more sources
Warm and cool starspots with opposite polarities [PDF]
Astronomy and Astrophysics, 2019 Aims. We present a temperature and a magnetic-field surface map of the K2 subgiant of the active binary II Peg. Employed are high resolution Stokes IV spectra obtained with the new Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the ...
Klaus Strassmeier, T A Carroll
exaly +2 more sources
Measuring the Temperature of Starspots from Multi-filter Photometry [PDF]
Astronomical Journal, 2023 Using simultaneous multi-filter observations during the transit of an exoplanet around a K dwarf star, we determine the temperature of a starspot through modeling the radius and position with wavelength-dependent spot contrasts.
Mary C. Schutte +7 more
semanticscholar +1 more source
Starspots, chromospheric emission lines, and flares of zero-age main-sequence stars [PDF]
Nippon Tenmon Gakkai obun kenkyu hokoku, 2022 Zero-age main-sequence (ZAMS) stars are considered to have enormous starspots and show strong chromospheric emission lines because of their strong surface magnetic field.
Mai Yamashita, Y. Itoh, Y. Oasa
semanticscholar +1 more source
Clinical and Translational Discovery, Volume 2, Issue 4, December 2022., 2022 Backgournd Variability is essential for the efficient functioning of multiple systems in nature. Systems do not function according to rigid rules, easy to determine. The reasons for such behaviour directly affect the design and efficient energy utilization.
Yaron Ilan
wiley +1 more source