Results 91 to 100 of about 4,942 (197)

Starspot Temperature of CoRoT-2 from Multiwavelength Observations with SPARC4

The Astrophysical Journal
Measuring starspot temperatures is crucial for understanding stellar magnetic activity as it affects stellar brightness variations, influences exoplanet transit measurements, and provides constraints on the physical conditions and energy transport in ...
Adriana Valio, Eder Martioli, Andre O. Kovacs, Viktor Y. D. Sumida, Leandro de Almeida, Diego Lorenzo-Oliveira, Francisco Jablonski, Claudia V. Rodrigues   +7 more
doaj   +1 more source

Starspots: signatures of stellar magnetic activity [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractStarspots, just as Sunspots, are among the most obvious tracers and signatures of stellar surface magnetic activity. Emphasized already several decades ago as the origin for the rotationally modulated brightness of cool late-type stars, it is just now that we start to trace individual surface features in great enough detail to understand their ...
openaire   +1 more source

Searching for star-planet magnetic interaction in CoRoT observations

, 2011
Close-in massive planets interact with their host stars through tidal and magnetic mechanisms. In this paper, we review circumstantial evidence for star-planet interaction as revealed by the photospheric magnetic activity in some of the CoRoT planet ...
A. Brandenburg, A. Brandenburg, A. F. Lanza, A. Kopp, A. Lecavelier Des Etangs, A. Silva-Valio, A. Silva-Valio, A. Vidal-Madjar, A.A. Vidotto, A.F. Lanza, A.F. Lanza, A.F. Lanza, A.F. Lanza, A.F. Lanza, A.F. Lanza, A.F. Lanza, A.F. Lanza, A.F. Lanza, B. Mosser, C. Catala, C. Moutou, C.A. Scharf, D. Ehrenreich, D.J. Acheson, D.J. Acheson, E. Shkolnik, E. Shkolnik, E. Shkolnik, F. Bouchy, G.A.H. Walker, H.-E. Fröhlich, I. Dobbs-Dixon, I. Pagano, I. Pillitteri, I.R. Stevens, J. Llama, J.-P. Zahn, J.C.B. Papaloizou, J.D. Hartman, K. Poppenhaeger, K. Poppenhaeger, K. Poppenhaeger, K.F. Huber, K.G. Strassmeier, L. Fossati, M. Cuntz, M. Dikpati, M. Jardine, N.C. Santos, O. Cohen, O. Cohen, O. Cohen, O. Cohen, O. Cohen, P. Zarka, P.-G. Gu, R. Fares, R. Oliver, S. Preusse, S.L.G. Hess, T. McIvor, T.V. Zaqarashvili, V. Holzwarth, V. Holzwarth, V.L. Kashyap, W. Borucki, W.-H. Ip, Y.-Q. Lou   +67 more
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What we don't know about starspots [PDF]

Symposium - International Astronomical Union, 1996
The scope of this paper will be starspots, and by that I mean regions cooler than the surrounding photosphere (like sunspots) but I also mean the whole range from very small (like sunspots) to very large (such as seen on very active stars like RS CVn).
openaire   +1 more source

Li I enhancement during a long-duration stellar flare [PDF]

, 1998
We report the possible detection of a Li I 6708 AA line enhancement during an unusual long-duration optical flare in the recently discovered, X-ray/EUV selected, chromospherically active binary 2RE J0743+224.
Montes, David, Ramsey, Lawrence W.
core   +1 more source

The chromospherically active binary star EI Eridani II. Long-term Doppler imaging

, 2008
Data from 11 years of continuous spectroscopic observations of the active RS CVn-type binary star EI Eridani - gained at NSO/McMath-Pierce, KPNO/Coude Feed and during the MUSICOS 98 campaign - were used to obtain 34 Doppler maps in three spectroscopic ...
Baliunas, Barnes, Berdyugina, Berdyugina, Berdyugina, Berdyugina, Choi, Donati, Elstner, Fekel, Frasca, Granzer, Gray, Harvey, Hatzes, Hatzes, Hatzes, Holzwarth, Jeffers, Korhonen, Korhonen, Marsden, Moss, Nordström, O'Neal, O'Neal, Oláh, Oláh, Oláh, Oláh, Petit, Pietrinferni, Piskunov, Radick, Rice, Rice, Rice, Solanki, Solanki, Strassmeier, Strassmeier, Strassmeier, Strassmeier, Strassmeier, Strassmeier, Tuominen, Vogt, Washuettl, Willson, Çakırlı   +49 more
core   +1 more source

Large Starspot Groups on HAT-P-11 in Activity Cycle 1 [PDF]

, 2018
Brett M. Morris, Suzanne L. Hawley, Leslie Hebb   +2 more
openalex   +1 more source

Possible Bright Starspots on TRAPPIST-1

The Astrophysical Journal, 2018
Abstract The M8V star TRAPPIST-1 hosts seven roughly Earth-sized planets and is a promising target for exoplanet characterization. Kepler/K2 Campaign 12 observations of TRAPPIST-1 in the optical show an apparent rotational modulation with a 3.3-day period, though that rotational signal is not readily detected in the Spitzer light curve ...
Brett M. Morris, Eric Agol, James R. A. Davenport, Suzanne L. Hawley   +3 more
openaire   +2 more sources

The CARMENES search for exoplanets around M dwarfs: Convective shift and starspot constraints from chromatic radial velocities [PDF]

, 2020
D. Baroch, J. C. Morales
openalex   +2 more sources

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