Výsledky vyhledávání - "Colin P. Folsom"

Akademický článek

Discovery of Magnetically Guided Metal Accretion onto a Polluted White Dwarf

Autor: Stefano Bagnulo, Jay Farihi, John D. Landstreet, Colin P. Folsom

Publikováno v: The Astrophysical Journal Letters, Vol 963, Iss 1, p L22 (2024)

Dynamically active planetary systems orbit a significant fraction of white dwarf stars. These stars often exhibit surface metals accreted from debris disks, which are detected through infrared excess or transiting structures. However, the full journe

Externí odkaz: https://doaj.org/article/131a290cce9e4485a12bf7d312ea4b54

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KELT-9 and its ultra-hot Jupiter: stellar parameters, composition, and planetary pollution

Autor: Mihkel Kama, Colin P Folsom, Adam S Jermyn, Johanna K Teske

KELT-9b is an ultra-hot Jupiter observed to be undergoing extreme mass loss. Its A0-type host star has a radiative envelope, which makes its surface layers prone to retaining recently accreted material. To search for potential signs of planetary mate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3ea73121f059af1662a89fb0c244f2fb

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A rare phosphorus-rich star in an eclipsing binary from TESS

Autor: Colin P. Folsom, Mihkel Kama, Tõnis Eenmäe, Indrek Kolka, Anna Aret, Vitalii Checha, Anni Kasikov, Laurits Leedjärv, Heleri Ramler

Context: Few exoplanets around hot stars with radiative envelopes have been discovered, although new observations from the TESS mission are improving this. Stars with radiative envelopes have little mixing at their surface, and thus their surface abu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f9906cbab12d8cc42a951555361326f
http://arxiv.org/abs/2111.07526

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Mitigating stellar activity jitter with different line lists for least-squares deconvolution: analysis of a parametric and a randomised line selection

Autor: Colin P. Folsom, Pascal Petit, Julien Morin, Claire Moutou, Gaitee A. J. Hussain, Andres Carmona, Xavier Delfosse, Stefano Bellotti

Stellar activity limits the radial velocity search and characterisation of exoplanets, as it introduces spurious jitter in the data sets and prevents the correct retrieval of a planetary signal. This is key for M dwarfs, considering that they manifes

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32eb2d3b62f1c68da24b03e804310bef
http://arxiv.org/abs/2110.10633

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Magnetic field and prominences of the young, solar-like, ultra-rapid rotator AP 149

Autor: Pascal Petit, Colin P. Folsom, T. Q. Cang, Jean-François Donati

Publikováno v: Proceedings of the International Astronomical Union. 15:181-184

Young solar analogs reaching the main sequence experience very strong magnetic activity, directly linked to their angular momentum loss through wind and mass ejections. We investigate here the surface and chromospheric activity of the ultra-rapid rot

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb519bcf9e3fa7af91cf785779afd158
https://doi.org/10.1017/s1743921319009864

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Field Linkage and Magnetic Helicity Density

Autor: Rim Fares, Julien Morin, Colin P. Folsom, Alexander Russell, Moira Jardine, Jean-François Donati, Stephen C. Marsden, Sandra V. Jeffers, Victor See, P. Petit, K. Lund

The helicity of a magnetic field is a fundamental property that is conserved in ideal MHD. It can be explored in the stellar context by mapping large-scale magnetic fields across stellar surfaces using Zeeman-Doppler imaging. A recent study of 51 sta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5731c51b80e56978daab758cbdfa0b45

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Pollux: A weak dynamo-driven dipolar magnetic field and implications for its probable planet

Autor: Colin P. Folsom, Jean-François Donati, Renada Konstantinova-Antova, Gregg A. Wade, Pascal Petit, O. Espagnet, Corinne Charbonnel, P. Mathias, Michel Aurière, Thierry Roudier

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 646, pp.A130. ⟨10.1051/0004-6361/202039573⟩
Astronomy and Astrophysics-A&A, 2021, 646, pp.A130. ⟨10.1051/0004-6361/202039573⟩

Context: Pollux is considered as an archetype of a giant star hosting a planet. We then discovered a weak magnetic field at its surface using spectropolarimetry. Aims and Methods: We followed up our investigations on Pollux first using ESPaDOnS at CF

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74bda7b4a795c45649496f393884017c
https://hal.archives-ouvertes.fr/hal-03146215/file/aa39573-20.pdf

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Beyond the dips of V807 Tau, a spectropolarimetric study of a dipper s magnetosphere

Autor: Luisa Rebull, Evelyne Alecian, Jean-François Donati, K. N. Grankin, Ann Marie Cody, K. Pouilly, Jerome Bouvier, Silvia H. P. Alencar, Colin P. Folsom

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2021, 656, pp.A50. ⟨10.1051/0004-6361/202140850⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 656, pp.A50. ⟨10.1051/0004-6361/202140850⟩
Astronomy and Astrophysics-A&A, EDP Sciences, In press
Astronomy and Astrophysics-A&A, 2021, ⟨10.1051/0004-6361/202140850⟩
HAL

We aim to characterize the magnetospheric accretion process in the young stellar object V807 Tau, one of the most stable dippers revealed by K2 in the Taurus star forming region. We performed photometric and spectropolarimetric follow-up observations

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::427b4444e7ad95c8ef8bda47a3ed55b6

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λ And: a post-main-sequence wind from a solar-mass star

Autor: Coralie Neiner, Aline A. Vidotto, Gregg Hallinan, Colin P. Folsom, D. Ó Fionnagáin, Pascal Petit, Ward B. Manchester

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2021, 500, pp.3438-3453. ⟨10.1093/mnras/staa3468⟩

We investigate the wind of lambda And, a solar-mass star that has evolved off the main sequence becoming a sub-giant. We present spectropolarimetric observations and use them to reconstruct the surface magnetic field of lambda And. Although much olde

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2e89cff4316fa75a342155bf7d0c6c11
https://resolver.caltech.edu/CaltechAUTHORS:20210202-103629939

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The large-scale magnetic field of Proxima Centauri near activity maximum

Autor: B. Zaire, Colin P. Folsom, X. Delfosse, E. Hébrard, Baptiste Klein, Jean-François Donati, Xavier Bonfils, Julien Morin

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2021, 500 (2), pp.1844-1850. ⟨10.1093/mnras/staa3396⟩
Monthly Notices of the Royal Astronomical Society, 2021, 500 (2), pp.1844-1850. ⟨10.1093/mnras/staa3396⟩
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, ⟨10.1093/mnras/staa3396⟩

We report the detection of a large-scale magnetic field at the surface of the slowly-rotating fully-convective M dwarf Proxima Centauri. Ten circular polarization spectra, collected from April to July 2017 with the HARPS-Pol spectropolarimeter, exhib

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24773bb2f5d520c0ff1b0fea6d7143d4
https://hal.archives-ouvertes.fr/hal-02996801

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