R. Silvotti
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View article: A comprehensive search for hot subdwarf stars using <i>Gaia</i> and TESS
A comprehensive search for hot subdwarf stars using <i>Gaia</i> and TESS Open
Context . Hot subdwarfs are compact, evolved stars that serve as critical testbeds for understanding binary evolution, stellar remnants, and pulsation physics. Their formation is often attributed to binary interactions, but a significant f…
View article: Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1–5 of TESS Photometry
Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1–5 of TESS Photometry Open
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 …
View article: A comprehensive search for hot subdwarf stars using <i>Gaia</i> and TESS
A comprehensive search for hot subdwarf stars using <i>Gaia</i> and TESS Open
Hot subdwarf B (sdB) stars are evolved, subluminous, helium-burning stars that most likely form when red giant stars loose their hydrogen envelope via interactions with close companions. They play an important role in our understanding of …
View article: A comprehensive search for hot subdwarf stars using Gaia and TESS I. Pulsating hot subdwarf B stars
A comprehensive search for hot subdwarf stars using Gaia and TESS I. Pulsating hot subdwarf B stars Open
Hot subdwarf B (sdB) stars are evolved, subluminous, helium-burning stars, most likely formed when red-giant stars lose their hydrogen envelope via interactions with close companions. They play an important role in our understanding of bin…
View article: Asteroseismological analysis of the polluted ZZ Ceti star G 29 − 38 with <i>TESS</i>
Asteroseismological analysis of the polluted ZZ Ceti star G 29 − 38 with <i>TESS</i> Open
G 29 − 38 (TIC 422526868) is one of the brightest (V = 13.1) and closest (d = 17.51 pc) pulsating white dwarfs with a hydrogen-rich atmosphere (DAV/ZZ Ceti class). It was observed by the TESS spacecraft in sectors 42 and 56. The atmosphere…
View article: Asteroseismological analysis of the polluted ZZ Ceti star G29-38 with TESS
Asteroseismological analysis of the polluted ZZ Ceti star G29-38 with TESS Open
G\,29$-$38 (TIC~422526868) is one of the brightest ($V=13.1$) and closest ($d = 17.51$\,pc) pulsating white dwarfs with a hydrogen-rich atmosphere (DAV/ZZ Ceti class). It was observed by the {\sl TESS} spacecraft in sectors 42 and 56. The …
View article: The GAPS Programme at TNG
The GAPS Programme at TNG Open
The nearby mid-K dwarf HIP 66074 was recently identified as host to a candidate super-Jupiter companion on a ∼300 day, almost edge-on, orbit, based on Gaia Data Release 3 (DR3) astrometry. Initial attempts at confirming the planetary natur…
View article: The TESS Input Catalog and Candidate Target List
The TESS Input Catalog and Candidate Target List Open
The Transiting Exoplanet Survey Satellite (TESS) will be conducting a nearly all-sky photometric survey over two years, with a core mission goal to discover small transiting exoplanets orbiting nearby bright stars. It will obtain 30 minute…
View article: The sdBV+dM close-to-synchronization binary TIC 137608661: inclination and thin disk population
The sdBV+dM close-to-synchronization binary TIC 137608661: inclination and thin disk population Open
TIC 137608661 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 detailed study of this system that was recently published (Silvotti et al., 2022), this a…
View article: Asteroseismology of hot subdwarf B stars observed with TESS: discovery of two new gravity mode pulsating stars
Asteroseismology of hot subdwarf B stars observed with TESS: discovery of two new gravity mode pulsating stars Open
TIC 033834484 and TIC 309658435 are long-period pulsating subdwarf B stars, which were observed extensively (675 and 621 days, respectively) by the Transiting Exoplanet Survey Satellite (TESS). The high-precision photometric light curve re…
View article: Asteroseismology of hot subdwarf B stars observed with TESS: discovery of two new gravity mode pulsating stars
Asteroseismology of hot subdwarf B stars observed with TESS: discovery of two new gravity mode pulsating stars Open
TIC033834484 and TIC309658435 are long-period pulsating subdwarf B star, which were observed extensively (675 and 621 days, respectively) by the Transiting Exoplanet Survey Satellite (TESS). The high-precision photometric light curve revea…
View article: <i>Gaia</i> white dwarfs within 40 pc – III. Spectroscopic observations of new candidates in the Southern hemisphere
<i>Gaia</i> white dwarfs within 40 pc – III. Spectroscopic observations of new candidates in the Southern hemisphere Open
We present a spectroscopic survey of 248 white dwarf candidates within 40 pc of the Sun; of these 244 are in the Southern hemisphere. Observations were performed mostly with the Very Large Telescope (X-Shooter) and Southern Astrophysical R…
View article: Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS Open
Context. The TESS space mission has recently demonstrated its great potential to discover new pulsating white dwarf and pre-white dwarf stars, and to detect periodicities with high precision in already known white-dwarf pulsators. Aims. We…
View article: Pulsating H-deficient WDs and pre-WDs observed with TESS: V. Discovery of two new DBV pulsators, WD J152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
Pulsating H-deficient WDs and pre-WDs observed with TESS: V. Discovery of two new DBV pulsators, WD J152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748 Open
The {\sl TESS} space mission has recently demonstrated its great potential to discover new pulsating white dwarf and pre-white dwarf stars, and to detect periodicities with high precision in already known white-dwarf pulsators. We report t…
View article: Anomalous Orbital Characteristics of the AQ Col (EC 05217-3914) System
Anomalous Orbital Characteristics of the AQ Col (EC 05217-3914) System Open
AQ Col (EC 05217-3914) is one of the first detected pulsating subdwarf B (sdB) stars and has been considered to be a single star. Photometric monitoring of AQ Col reveals a pulsation timing variation with a period of 486 days, interpreted …
View article: 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
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 Open
TIC 137608661/TYC 4544-2658-1/FBS 0938+788 is a new sdBV+dM reflection-effect binary discovered by the TESS space mission with an orbital period of 7.21 h. In addition to the orbital frequency and its harmonics, the Fourier transform of TI…
View article: Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS Open
Context. The collection of high-quality photometric data by space telescopes, such as the completed Kepler mission and the ongoing TESS program, is revolutionizing the area of white-dwarf asteroseismology. Among the different kinds of puls…
View article: Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with {\it TESS}: III. Asteroseismology of the DBV star GD 358
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with {\it TESS}: III. Asteroseismology of the DBV star GD 358 Open
The collection of high-quality photometric data by space telescopes is revolutionizing the area of white-dwarf asteroseismology. Among the different kinds of pulsating white dwarfs, there are those that have He-rich atmospheres, and they a…
View article: Discovery of a Uniquely Cool and Compact Source at 28 pc from the Sun
Discovery of a Uniquely Cool and Compact Source at 28 pc from the Sun Open
We present the discovery of what appears to be both a uniquely cool and old white dwarf (WD) within 30 pc of the Sun. DES J214756.46-403529.3 is detected in four separate surveys, 50° away from the Galactic Plane. The combination of its ve…
View article: Discovery of a uniquely cool and compact source at 28 parsecs from the Sun
Discovery of a uniquely cool and compact source at 28 parsecs from the Sun Open
We present the discovery of what appears to be both a uniquely cool and old white dwarf within 30 parsecs of the sun. DES J214756.46-403529.3 is detected in four separate surveys, 50 degrees away from the Galactic Plane. The combination of…
View article: Discovery of a uniquely cool and compact source at 28 parsecs from the\n Sun
Discovery of a uniquely cool and compact source at 28 parsecs from the\n Sun Open
We present the discovery of what appears to be both a uniquely cool and old\nwhite dwarf within 30 parsecs of the sun. DES J214756.46-403529.3 is detected\nin four separate surveys, 50 degrees away from the Galactic Plane. The\ncombination…
View article: Orbital Characteristics of the AQ~Col (EC~05217-3914) System
Orbital Characteristics of the AQ~Col (EC~05217-3914) System Open
AQ Col (EC~05217-3914) is one of the first detected pulsating subdwarf B (sdB) stars and has been considered to be a single star. However, its periodic pulsation timing variations indicate that AQ Col may not be a single star. We present p…
View article: Amplitude and frequency variability of the pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 observed with the Whole Earth Telescope
Amplitude and frequency variability of the pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 observed with the Whole Earth Telescope Open
We have acquired new time series photometry of the two pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 with the Whole Earth Telescope. Additional single-site photometry is also presented. We use all these data plus all availa…
View article: The pulsation modes of the pre-white dwarf PG 1159-035
The pulsation modes of the pre-white dwarf PG 1159-035 Open
Context. PG 1159-035 , a pre-white dwarf with $T_{{\rm eff}}$$\simeq$ 140 000 K, is the prototype of both two classes: the PG 1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-035 photometric data obtained w…
View article: Asteroseismic analysis of variable hot subdwarf stars observed with TESS
Asteroseismic analysis of variable hot subdwarf stars observed with TESS Open
Context. We present photometric and spectroscopic analyses of gravity ( g -mode) long-period pulsating hot subdwarf B (sdB) stars, also called V1093 Her stars, observed by the TESS space telescope in both 120 s short-cadence and 20 s ultra…
View article: Asteroseismic analysis of variable hot subdwarf stars observed with TESS I. The mean g-mode period spacings in hot subdwarf B stars
Asteroseismic analysis of variable hot subdwarf stars observed with TESS I. The mean g-mode period spacings in hot subdwarf B stars Open
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} aim…
View article: A search for transiting planets around hot subdwarfs
A search for transiting planets around hot subdwarfs Open
Context. Hot subdwarfs experienced strong mass loss on the red giant branch (RGB) and are now hot and small He-burning objects. These stars constitute excellent opportunities for addressing the question of the evolution of exoplanetary sys…
View article: A transit survey to search for planets around hot subdwarfs: I. methods and performance tests on light curves from Kepler, K2, TESS, and CHEOPS
A transit survey to search for planets around hot subdwarfs: I. methods and performance tests on light curves from Kepler, K2, TESS, and CHEOPS Open
Context. Hot subdwarfs experienced strong mass loss on the Red Giant Branch (RGB) and are now hot and small He-burning objects. Aims. In this project we aim to perform a transit survey in all available light curves of hot subdwarfs from sp…
View article: Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: I. Asteroseismology of the GW Vir stars RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371, and K 1-16
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: I. Asteroseismology of the GW Vir stars RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371, and K 1-16 Open
In this paper, we present a detailed asteroseismological analysis of six GW Vir stars including the observations collected by the TESS mission. We processed and analyzed TESS observations of RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501,…
View article: EPIC 216747137: a new HW Vir eclipsing binary with a massive sdOB primary and a low-mass M-dwarf companion
EPIC 216747137: a new HW Vir eclipsing binary with a massive sdOB primary and a low-mass M-dwarf companion Open
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…