Výsledky vyhledávání - "Roberto Silvotti"

Akademický článek

Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1–5 of TESS Photometry

Autor: Keyu Xing, Weikai Zong, Roberto Silvotti, Jian-Ning Fu, Stéphane Charpinet, Tianqi Cang, J. J. Hermes, Xiao-Yu Ma, Haotian Wang, Xuan Wang, Tao Wu, Jiaxin Wang

Publikováno v: The Astrophysical Journal Supplement Series, Vol 271, Iss 2, p 57 (2024)

Stellar flares are critical phenomena on stellar surfaces, which are closely tied to stellar magnetism. While extensively studied in main-sequence (MS) stars, their occurrence in evolved compact stars, specifically hot subdwarfs and white dwarfs (WDs

Externí odkaz: https://doaj.org/article/03cf25141eec441a805d1ef3d9020897

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Filling the gap between synchronized and non-synchronized sdBs in short-period sdBV+dM binaries with TESS: TIC 137608661, a new system with a well-defined rotational splitting

Autor: Roberto Silvotti, Péter Németh, John H Telting, Andrzej S Baran, Roy H Østensen, Jakub Ostrowski, Sumanta K Sahoo, Saskia Prins

Publikováno v: Monthly Notices of the Royal Astronomical Society. 511:2201-2217

TIC137608661/TYC4544-2658-1/FBS0938+788 is a new sdBV+dM reflection-effect binary discovered by the TESS space mission with an orbital period of 7.21 hours. In addition to the orbital frequency and its harmonics, the Fourier transform of TIC137608661

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0664ec7ed7e8563ebd6e598aff74b806
https://doi.org/10.1093/mnras/stac160

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EPIC 216747137: a new HW Vir eclipsing binary with a massive sdOB primary and a low-mass M-dwarf companion

Autor: Luigi Mancini, U. Heber, David Kilkenny, Horst Drechsel, Roy Ostensen, Andreas Irrgang, J. H. Telting, V. Schaffenroth, J. Vos, Roberto Silvotti, Simona Ciceri

Publikováno v: Monthly Notices of the Royal Astronomical Society. 500:2461-2474

EPIC 216747137 is a new HW~Virginis system discovered by the Kepler spacecraft during its K2 "second life". Like the other HW Vir systems, EPIC 216747137 is a post-common-envelope eclipsing binary consisting of a hot subluminous star and a cool low-m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c051a4447c778086699d3f5efcd99be
https://doi.org/10.1093/mnras/staa3332

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Asteroseismic analysis of variable hot subdwarf stars observed with TESS : I, the mean g-mode period spacings in hot subdwarf B stars

Autor: M. Vučković, Michael D. Reed, Sumanta K. Sahoo, Roberto Silvotti, Roy Ostensen, Péter Németh, John H. Telting, K. A. Shoaf, Andrzej S. Baran, Miller Bertolami, Murat Uzundag

Publikováno v: CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET

We present photometric and spectroscopic analyses of gravity (g-mode) long-period pulsating hot subdwarf B (sdB) stars. We perform a detailed asteroseismic and spectroscopic analysis of five pulsating sdB stars observed with {\it TESS} aiming at the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3378005cbb1d98ab6d4d8cfb508f261
https://www.aanda.org/10.1051/0004-6361/202140961

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A planetesimal orbiting within the debris disc around a white dwarf star

Publikováno v: Science, 364(6435), 66-69. American Association for the Advancement of Science
Science, 364(6435), 66-69

Many white dwarf stars show signs of having accreted smaller bodies, implying that they may host planetary systems. A small number of these systems contain gaseous debris discs, visible through emission lines. We report a stable 123.4min periodic var

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::468843d30a5e3d8ed564f88896833435
https://doi.org/10.1126/science.aat5330

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A search for transiting planets around hot subdwarfs: I. Methods and performance tests on light curves from Kepler, K2, TESS, and CHEOPS

Autor: Pierre F. L. Maxted, S. C. C. Barros, Sébastien Charnoz, Luca Fossati, J-Y. Plesseria, Davide Gandolfi, Valentina Viotto, Roland Ottensamer, Isabella Pagano, Nicola Rando, Michaël Gillon, Anders Erikson, Alexis M. S. Smith, Roy Ostensen, A. Bekkelien, Giampaolo Piotto, Olivier Demangeon, Wolfgang Baumjohann, M. Steller, N. Thomas, Kevin Heng, Roberto Ragazzoni, K. Westerdorff, A. Thuillier, Valerio Nascimbeni, Nuno C. Santos, Heike Rauer, Manuel Guedel, David Barrado, C. Lovis, Enric Palle, Damien Ségransan, Demetrio Magrin, Magali Deleuil, Jacques Laskar, Alexander J. Mustill, G. Anglada Escudé, C. Broeg, Monika Lendl, Stéphane Charpinet, B.-O. Demory, T. Bárczy, Gisbert Peter, Francisco J. Pozuelos, M. Mecina, László L. Kiss, Nicolas Billot, J. Cabrera, M. Fridlund, L. Delrez, D. Queloz, G. Bruno, Andrea Fortier, Thomas Beck, Willy Benz, Don Pollacco, Gaetano Scandariato, K. G. Isaak, Andrew Collier Cameron, Brad N. Barlow, Valérie Van Grootel, Xavier Bonfils, Roberto Silvotti, Roi Alonso, Stéphane Udry, Yann Alibert, Melvyn B. Davies, N. A. Walton, D. Futyan, David Ehrenreich, A. Lecavelier des Etangs, Göran Olofsson, J. Asquier, M. Dévora-Pajares, S. G. Sousa, Gyula M. Szabó, A. E. Simon, Alexis Brandeker, Ignasi Ribas, Sergio Hoyer, T. G. Wilson, M. Beck

Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
instname
Astronomy and Astrophysics, 650
Digibug. Repositorio Institucional de la Universidad de Granada
Astronomy & Astrophysics

We thank the anonymous referee for comments that improved the manuscript. The authors thank the Belgian Federal Science Policy Office (BELSPO) for the provision of financial support in the framework of the PRODEX Programme of the European Space Agenc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d2aa6d7daa0107c30984eb8749524725
http://hdl.handle.net/10261/254075

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Gaia white dwarfs within 40 pc – I. Spectroscopic observations of new candidates

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, 2020, 497 (1), pp.130-145. ⟨10.1093/mnras/staa1892⟩
Digital.CSIC. Repositorio Institucional del CSIC
instname
Monthly Notices of the Royal Astronomical Society, 2020, 497 (1), pp.130-145. ⟨10.1093/mnras/staa1892⟩
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)

We present a spectroscopic survey of 230 white dwarf candidates within 40 pc of the Sun from the William Herschel Telescope and Gran Telescopio Canarias. All candidates were selected from Gaia Data Release 2 (DR2) and in almost all cases, had no prio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::19ee88773b2c52c0ed1a2f5a8ae9ccd2
https://hal.archives-ouvertes.fr/hal-03001737/document

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Mode identification in three pulsating hot subdwarfs observed with TESS satellite

Autor: Roberto Raddi, Michael D. Reed, H. Ghasemi, Jakub Ostrowski, Roberto Silvotti, K. A. Shoaf, Weikai Zong, S K Sahoo, Maja Vučković, Murat Uzundag, Keaton J. Bell, U. Heber, S. Sanjayan, Andrzej S. Baran, Andreas Irrgang

Publikováno v: UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)

We report on the detection of pulsations of three pulsating subdwarf B stars observed by the TESS satellite and our results of mode identification in these stars based on an asymptotic period relation. SB 459 (TIC 067584818), SB 815 (TIC 169285097) a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cad0970f6d946aacc1e71f4dc6d6ccf
https://hdl.handle.net/2117/335767

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The EXOTIME project: signals in the O-C diagrams of the rapidly pulsating subdwarfs DW Lyn, V1636 Ori, QQ Vir, and V541 Hya

Publikováno v: Astronomy and astrophysics, Paris : EDP Sciences, 2020, vol. 638, art. no. A108, p. [1-19]

We aim to investigate variations in the arrival time of coherent stellar pulsations due to the light-travel time effect to test for the presence of sub-stellar companions. Those companions are the key to one possible formation scenario of apparently

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::acaf4949be412289131b22fb671e8c51
http://hdl.handle.net/20.500.12386/31643

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TESS first look at evolved compact pulsators. Discovery and asteroseismic probing of the g-mode hot B subdwarf pulsator EC 21494-7018

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 632, pp.A90. ⟨10.1051/0004-6361/201935395⟩
Charpinet, S, Brassard, P, Fontaine, G, Van Grootel, V, Zong, W, Giammichele, N, Heber, U, Bognar, Z, Geier, S, Green, E M, Hermes, J J, Kilkenny, D, Ostensen, R H, Pelisoli, I, Silvotti, R, Telting, J H, Vuckovic, M, Worters, H L, Baran, A S, Bell, K J, Bradley, P A, Debes, J H, Kawaler, S D, Kolaczek-Szymanski, P, Murphy, S J, Pigulski, A, Sodor, A, Uzundag, M, Handberg, R, Kjeldsen, H, Ricker, G R & Vanderspek, R K 2019, ' TESS first look at evolved compact pulsators Discovery and asteroseismic probing of the g-mode hot B subdwarf pulsator EC 21494-7018 ', Astronomy & Astrophysics, vol. 632, no. December, 90 . https://doi.org/10.1051/0004-6361/201935395
Astronomy and Astrophysics-A&A, 2019, 632, pp.A90. ⟨10.1051/0004-6361/201935395⟩

We present the discovery and asteroseismic analysis of a new g-mode hot B subdwarf (sdB) pulsator, EC 21494-7018 (TIC 278659026), monitored in TESS first sector using 120-second cadence. The light curve analysis reveals that EC 21494-7018 is a sdB pu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1265ea4faa2cf20e9c39a3da26e67c5a
https://hal.archives-ouvertes.fr/hal-03001836

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