Results 51 to 60 of about 1,347 (178)

Magnetic activity on the young Sun: A case study of EK Draconis

Astronomy & Astrophysics
Context. Young solar analog stars provide key insights into the early stages of stellar evolution, particularly in terms of magnetic activity and rotation.
Görgei A., Kriskovics L., Vida K., Seli B., Oláh K., Sági P., Bódi A., Järvinen S. P., Strassmeier K. G., Pál A., Kővári Zs.   +10 more
doaj   +1 more source

Doppler imaging combined with high-cadence photometry

Astronomy & Astrophysics
Context. Latitude distribution of stellar magnetic activity is not well constrained by observations, despite its importance for a better understanding of stellar dynamos and their effects on planetary environments. Aims.
Lee S., Bahar E., Şenavcı H. V., Işık E., Ikuta K., Namekata K., Nagata H., Kawauchi K., Omiya M., Izumiura H., Tajitsu A., Sato B., Honda S., Nogami D.   +13 more
doaj   +1 more source

The Connection between Starspots and Flares on Main-sequence Kepler Stars [PDF]

, 2018
Starspots and flares are indicators of stellar magnetic activity and can both be studied in greater detail by utilizing the long-term, space- based archive of the Kepler satellite.
Vida, Krisztián, Roettenbacher, Rachael M.,, Roettenbacher, Rachael M.   +2 more
core   +1 more source

Starspot detection and properties [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractI review the currently available techniques for the starspots detection including the one-dimensional spot modelling of photometric light curves. Special attention will be paid to the modelling of photospheric activity based on the high-precision light curves obtained with space missions MOST, CoRoT, and Kepler.
openaire   +1 more source

Forward modeling solar spectra onto Doppler images of λ And

Astronomy & Astrophysics
Context. Due to their high chromospheric activity and photometric variability, RS CVn-type binaries are ideal laboratories for studying stellar surface structures and the corresponding stellar activity relations.
Adebali Ö., Pietrow A. G. M.
doaj   +1 more source

High Tide or Riptide on the Cosmic Shoreline? A Water-rich Atmosphere or Stellar Contamination for the Warm Super-Earth GJ 486b from JWST Observations

The Astrophysical Journal Letters, 2023
Planets orbiting M-dwarf stars are prime targets in the search for rocky exoplanet atmospheres. The small size of M dwarfs renders their planets exceptional targets for transmission spectroscopy, facilitating atmospheric characterization.
Sarah E. Moran, Kevin B. Stevenson, David K. Sing, Ryan J. MacDonald, James Kirk, Jacob Lustig-Yaeger, Sarah Peacock, L. C. Mayorga, Katherine A. Bennett, Mercedes López-Morales, E. M. May, Zafar Rustamkulov, Jeff A. Valenti, Jéa I. Adams Redai, Munazza K. Alam, Natasha E. Batalha, Guangwei Fu, Junellie Gonzalez-Quiles, Alicia N. Highland, Ethan Kruse, Joshua D. Lothringer, Kevin N. Ortiz Ceballos, Kristin S. Sotzen, Hannah R. Wakeford   +23 more
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Starspots on the active young solar-type star AH Lep

, 2010
Young solar-type stars inform us about the early evolution of objects that form a major component of the stellar population of our galaxy. Single active young solar-type stars close to the Sun’s mass also provide us with proxies for the Sun’s early ...
Treschman, Keith
core   +1 more source

Measuring the Temperature of Starspots from Multi-filter Photometry

The 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.
Maria C. Schutte, Leslie Hebb, John P. Wisniewski, Caleb I. Cañas, Jessica E. Libby-Roberts, Andrea S. J. Lin, Paul Robertson, Gumundur Stefánsson   +7 more
doaj   +1 more source

Surface image and activity-corrected orbit of the RSCVn binary HR7275

Astronomy & Astrophysics
Context. Quantifying stellar parameters and magnetic activity for cool stars in double-lined spectroscopic binaries (SB2s) is not straightforward, as both stars contribute to the observed composite spectra and are likely variable.
Adebali Ö., Weber M., Strassmeier K. G., Ilyin I. V., Steffen M., Kővári Zs.   +5 more
doaj   +1 more source

Mapping Stellar Surfaces. II. An Interpretable Gaussian Process Model for Light Curves

The Astronomical Journal, 2021
The use of Gaussian processes (GPs) as models for astronomical time series data sets has recently become almost ubiquitous, given their ease of use and flexibility.
Rodrigo Luger, Daniel Foreman-Mackey, Christina Hedges   +2 more
doaj   +1 more source