Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Mark S. Giampapa"'
Publikováno v:
The Astronomical Journal, Vol 168, Iss 6, p 234 (2024)
We apply multialgorithm machine learning models to TESS 2 minute survey data from Sectors 1–72 to identify stellar flares. Models trained with deep neural network, random forest, and XGBoost algorithms utilize four flare light-curve characteristics
Externí odkaz:
https://doaj.org/article/262ae4da9f4547ad97f7c500d9916497
Autor:
Benjamin V Rackham, Néstor Espinoza, Svetlana V Berdyugina, Heidi Korhonen, Ryan J MacDonald, Benjamin T Montet, Brett M Morris, Mahmoudreza Oshagh, Alexander I Shapiro, Yvonne C Unruh, Elisa V Quintana, Robert T Zellem, Dániel Apai, Thomas Barclay, Joanna K Barstow, Giovanni Bruno, Ludmila Carone, Sarah L Casewell, Heather M Cegla, Serena Criscuoli, Catherine Fischer, Damien Fournier, Mark S Giampapa, Helen Giles, Aishwarya Iyer, Greg Kopp, Nadiia M Kostogryz, Natalie Krivova, Matthias Mallonn, Chima McGruder, Karan Molaverdikhani, Elisabeth R Newton, Mayukh Panja, Sarah Peacock, Kevin Reardon, Rachael M Roettenbacher, Gaetano Scandariato, Sami Solanki, Keivan G Stassun, Oskar Steiner, Kevin B Stevenson, Jeremy Tregloan-Reed, Adriana Valio, Sven Wedemeyer, Luis Welbanks, Jie Yu, Munazza K Alam, James R A Davenport, Drake Deming, Chuanfei Dong, Elsa Ducrot, Chloe Fisher, Emily Gilbert, Veselin Kostov, Mercedes López-Morales, Mike Line, Teo Močnik, Susan Mullally, Rishi R Paudel, Ignasi Ribas, Jeff A Valenti
Study Analysis Group 21 (SAG21) of NASA's Exoplanet Exploration Program Analysis Group (ExoPAG) was organized to study the effect of stellar contamination on space-based transmission spectroscopy, a method for studying exoplanetary atmospheres by mea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28df0a1f7399c2c4012f03d78e81a4eb
http://arxiv.org/abs/2201.09905
http://arxiv.org/abs/2201.09905
Autor:
Axel Brandenburg, Mark S. Giampapa
High precision photometry of solar-like members of the open cluster M67 with Kepler/K2 data has recently revealed enhanced activity for stars with a large Rossby number, which is the ratio of rotation period to the convective turnover time. Contrary
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd26e032e0069c7495e321b5fc41618c
http://arxiv.org/abs/1802.08689
http://arxiv.org/abs/1802.08689
Transmission spectra are differential measurements that utilize stellar illumination to probe transiting exoplanet atmospheres. Any spectral difference between the illuminating light source and the disk-integrated stellar spectrum due to starspots an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d667412151d3a61d9e8755a61e583c3
http://arxiv.org/abs/1711.05691
http://arxiv.org/abs/1711.05691
Simultaneous, high-quality measurements of the neutral helium triplet features at 5876 Å and 10830 Å in a sample of solar-type stars are presented. The observations were made with ESO telescopes at the La Silla Paranal Observatory under program ID
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46d265afe7baccf9c43c798e7fe1aac7
http://hdl.handle.net/20.500.12386/27409
http://hdl.handle.net/20.500.12386/27409
Autor:
Mark S. Giampapa
Publikováno v:
Proceedings of the International Astronomical Union. 7:257-267
We discuss the general properties of stellar cycles with emphasis on their amplitudes as a function of stellar parameters, particularly those stellar characteristics relevant to dynamo-driven magnetic activity. We deduce an empirical scaling relation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97a81722292d0a79fb0db34f598ac1a9
https://doi.org/10.1017/s1743921312004954
https://doi.org/10.1017/s1743921312004954
Autor:
Mark S. Giampapa
Publikováno v:
Proceedings of the International Astronomical Union. 6:68-73
The evolution of stellar activity involves a complex interplay between the interior dynamo mechanism, the emergent magnetic field configurations and their coupling with stellar winds, the subsequent angular momentum evolution, and fundamental stellar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed0c611e068903cfe5b8e848df86770f
https://doi.org/10.1017/s174392131101502x
https://doi.org/10.1017/s174392131101502x
Autor:
Ngoc Phan-Bao, J. Liebert, Christopher M. Johns-Krull, Mark S. Giampapa, E. L. Martín, Gibor Basri, W. H. Sherry, J. E. Gizis, Edo Berger, R. E. Rutledge, Thomas A. Fleming
Publikováno v:
The Astrophysical Journal. 676:1307-1318
[Abridged] As part of our on-going investigation of magnetic activity in ultracool dwarfs we present simultaneous radio, X-ray, UV, and optical observations of LSR1835+32 (M8.5), and simultaneous X-ray and UV observations of VB10 (M8), both with a du
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cbc20f7137749f5b27ab5133fa2de290
https://doi.org/10.1086/529131
https://doi.org/10.1086/529131
Autor:
W. H. Sherry, Thomas A. Fleming, Edo Berger, R. E. Rutledge, Gibor Basri, E. L. Martín, J. Liebert, Christopher M. Johns-Krull, Ngoc Phan-Bao, Mark S. Giampapa, J. E. Gizis
Publikováno v:
The Astrophysical Journal. 673:1080-1087
[Abridged] We present the first simultaneous radio, X-ray, ultraviolet, and optical spectroscopic observations of the M8.5 dwarf TVLM513-46546, with a duration of 9 hours. These observations are part of a program to study the origin of magnetic activ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f9323e5b5d626ac2372268df7f89148
https://doi.org/10.1086/524769
https://doi.org/10.1086/524769
Publikováno v:
The Astronomical Journal. 134:1488-1502
We present the results of the first MOTESS-GNAT variable-star survey, a deep, wide-field variability survey conducted over 2 yr with a total sky coverage of 300 deg2. In this survey, we identified 26,042 variable-star candidates with magnitudes R = 1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d8d3b3c661ba7fb2c381cab4a6979c9d
https://doi.org/10.1086/521148
https://doi.org/10.1086/521148