S. Charpinet
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View article: The Arizona-Montréal spectroscopic survey of hot subluminous stars -- Additional Table and Figures
The Arizona-Montréal spectroscopic survey of hot subluminous stars -- Additional Table and Figures Open
These files are additional material from Appendix D and E of the paper entitled "The Arizona-Montréal spectroscopic survey of hot subluminous stars" accepted for publication in Astronomy and Astrophysics and currently available at https://…
View article: The theoretical pulsation spectra of hot B subdwarfs
The theoretical pulsation spectra of hot B subdwarfs Open
Context. The Kepler and TESS space missions have revealed the rich gravity ( g -)mode pulsation spectra of many hot subdwarf B (sdB) stars in detail. These spectra exhibit complex behaviors, with some stars exhibiting trapped modes interpo…
View article: Distinguishing super-Nyquist frequencies via their temporal variation in <i>γ</i> Doradus stars from continuous photometry
Distinguishing super-Nyquist frequencies via their temporal variation in <i>γ</i> Doradus stars from continuous photometry Open
Given their tendency to mix in with real pulsations, the reflection of super-Nyquist frequencies (SNFs) pose a threat to asteroseismic properties. Although SNFs have been studied in several pulsating stars, a systematic survey remains to b…
View article: Distinguishing super-Nyquist frequencies via their temporal variation in $γ$ Doradus stars from continuous photometry
Distinguishing super-Nyquist frequencies via their temporal variation in $γ$ Doradus stars from continuous photometry Open
As mixed with real pulsations, the reflection of super-Nyquist frequencies (SNFs) pose a threat to asteroseismic properties. Although SNFs have been studied in several pulsating stars, a systematic survey remains scarcely explored. Here we…
View article: TIC 441725813: A new bright hybrid hot B subdwarf pulsator with differential core versus envelope rotation
TIC 441725813: A new bright hybrid hot B subdwarf pulsator with differential core versus envelope rotation Open
Context. The Transiting Exoplanet Survey Satellite (TESS) performs high-precision photometry over almost the whole sky primarily in search of exoplanet transits. It also provides exquisite data to study stellar variability, in particular f…
View article: TIC441725813: A new bright hybrid sdB pulsator with differential core/envelope rotation
TIC441725813: A new bright hybrid sdB pulsator with differential core/envelope rotation Open
We present the detailed analysis of a new hybrid (p- and g-mode) sdB pulsator, TIC441725813 (TYC 4427-1021-1), discovered and monitored by TESS over 670 days. The TESS light curves available for this star were analysed using prewhitening t…
View article: HR 10 as seen by CHEOPS and TESS. Revealing delta Scuti pulsations, granulation-like signal and hint for transients
HR 10 as seen by CHEOPS and TESS. Revealing delta Scuti pulsations, granulation-like signal and hint for transients Open
HR 10 has only recently been identified as a binary system. Previously thought to be an A-type shell star, it appears that both components are fast-rotating A-type stars, each presenting a circumstellar envelope. Although showing complex p…
View article: An improved asteroseismic age of the rapid rotator Altair from TESS data
An improved asteroseismic age of the rapid rotator Altair from TESS data Open
Understanding the effects of rotation in stellar evolution is key to modelling early-type stars, half of which have equatorial velocities over 100 km/s. The nearby star Altair is an example of such fast-rotating stars, and furthermore, it …
View article: An improved asteroseismic age of the rapid rotator Altair from TESS data
An improved asteroseismic age of the rapid rotator Altair from TESS data Open
Context. Understanding the effects of rotation in stellar evolution is key to modelling early-type stars, half of which have equatorial velocities over 100 km s −1 . The nearby star Altair is an example of such fast-rotating stars, and fur…
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: Short-period pulsating hot subdwarf stars observed by TESS
Short-period pulsating hot subdwarf stars observed by TESS Open
We present the results of an extension of our Transiting Exoplanet Survey Satellite (TESS) search for short-period pulsations in compact stellar objects observed during the second and fourth years of the TESS mission, which targeted the no…
View article: Short-period pulsating hot-subdwarf stars observed by TESS II. Northern ecliptic hemisphere
Short-period pulsating hot-subdwarf stars observed by TESS II. Northern ecliptic hemisphere Open
We present results of a continuation of our Transiting Exoplanet Survey Satellite (TESS) search for short-period pulsations in compact stellar objects observed during Years 2 and 4 of the TESS mission that targeted the northern ecliptic he…
View article: Amplitude and frequency variations in PG 0101+039 from K2 photometry
Amplitude and frequency variations in PG 0101+039 from K2 photometry Open
Context. K2 photometry is suitable for the exploitation of mode variability on short timescales in hot B subdwarf stars and this technique is useful in constraining nonlinear quantities addressed by the stellar theory of high-order perturb…
View article: Amplitude and frequency variations in PG~0101+039 from K2 photometry -- A pulsating hot B subdwarf star in an unsynchronized binary system
Amplitude and frequency variations in PG~0101+039 from K2 photometry -- A pulsating hot B subdwarf star in an unsynchronized binary system Open
K2 photometry is suitable for the exploitation of mode variability on short timescales in hot B subdwarf stars, which is important to constrain nonlinear quantities addressed by the stellar theory of high-order perturbation in the future. …
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: Gender and Precarity in Astronomy
Gender and Precarity in Astronomy Open
Following the survey Well-being in astrophysics that was sent out in March 2021, to establish how astrophysics researchers, primarily in France, experience their career, some of the results were published in Webb et al. (2021). Here we fur…
View article: The cradle of nonlinear asteroseismology: observations of oscillation mode variability in compact pulsating stars
The cradle of nonlinear asteroseismology: observations of oscillation mode variability in compact pulsating stars Open
We briefly review progress in developing a pathway to nonlinear astereoseismology, both from theoretical and observational aspects. As predicted by the theory of weak nonlinear interactions between resonant modes, their amplitude and frequ…
View article: À la recherche de transits planétaires autour d’étoiles sous-naines chaudes
À la recherche de transits planétaires autour d’étoiles sous-naines chaudes Open
Hot subdwarf stars are small post-red-giant-branch stars. To this day, no planets have been confirmed around them. In this document we present the first results of our analysis to quantify the presence of planets around hot subdwarfs by pe…
View article: The cradle of nonlinear asteroseismology: observations of oscillation mode variability in compact pulsating stars
The cradle of nonlinear asteroseismology: observations of oscillation mode variability in compact pulsating stars Open
We briefly review progress in developing a pathway to nonlinear astereoseismology, both from theoretical and observational aspects. As predicted by the theory of weak nonlinear interactions between resonant modes, their amplitude and frequ…
View article: Short-period pulsating hot-subdwarf stars observed by TESS I. Southern ecliptic hemisphere
Short-period pulsating hot-subdwarf stars observed by TESS I. Southern ecliptic hemisphere Open
We present results of a Transiting Exoplanet Survey Satellite (TESS) search for short-period pulsations in compact stellar objects observed in years 1 and 3 of the TESS mission, during which the southern ecliptic hemisphere was targeted. W…
View article: Short-period pulsating hot-subdwarf stars observed by TESS
Short-period pulsating hot-subdwarf stars observed by TESS Open
We present results of a Transiting Exoplanet Survey Satellite (TESS) search for short-period pulsations in compact stellar objects observed in years 1 and 3 of the TESS mission, during which the southern ecliptic hemisphere was targeted. W…
View article: A search for transiting planets around hot subdwarfs - Results from TESS Cycle I
A search for transiting planets around hot subdwarfs - Results from TESS Cycle I Open
<p>In this talk I will present our project that is dedicated to the search for transiting planets around hot subdwarfs (sdOB). These peculiar bodies are evolved stars that lost most of their envelope at the tip of the Red-Giant-Branc…
View article: K2 Photometry on Oscillation Mode Variability: The New Pulsating Hot B Subdwarf Star EPIC 220422705
K2 Photometry on Oscillation Mode Variability: The New Pulsating Hot B Subdwarf Star EPIC 220422705 Open
We present an analysis of oscillation mode variability in the hot B subdwarf star EPIC 220422705, a new pulsator discovered from ∼78 days of K2 photometry. The high-quality light curves provide a detection of 66 significant independent fre…
View article: Seismic Cartography of White-Dwarf Interiors From the Toulouse-Montréal Optimal-Design Approach
Seismic Cartography of White-Dwarf Interiors From the Toulouse-Montréal Optimal-Design Approach Open
Probing internal properties of white-dwarf stars has been amongst the earliest objectives of asteroseismology, following the first discovery in the late 1960s of non-radial pulsations in these evolved compact stars. It was swiftly recogniz…
View article: A search for transiting planets around hot subdwarfs
A search for transiting planets around hot subdwarfs Open
Context. Hot subdwarfs, which are hot and small He-burning objects, are ideal targets for exploring the evolution of planetary systems after the red giant branch (RGB). Thus far, no planets have been confirmed around them, and no systemati…
View article: Tidally Tilted Pulsations in HD 265435, a Subdwarf B Star with a Close White Dwarf Companion
Tidally Tilted Pulsations in HD 265435, a Subdwarf B Star with a Close White Dwarf Companion Open
Tidally tilted pulsators (TTPs) are an intriguing new class of oscillating stars in binary systems; in such stars, the pulsation axis coincides with the line of apsides, or tidal axis, of the binary. All three TTPs discovered so far have b…
View article: Tidally Tilted Pulsations in HD 265435, a subdwarf B Star with a Close White Dwarf Companion
Tidally Tilted Pulsations in HD 265435, a subdwarf B Star with a Close White Dwarf Companion Open
Tidally tilted pulsators (TTPs) are an intriguing new class of oscillating stars in binary systems; in such stars, the pulsation axis coincides with the line of apsides, or semi-major axis, of the binary. All three TTPs discovered so far h…
View article: Tidally Tilted Pulsations in HD 265435: a subdwawrf B Star with a Close White Dwarf Companion
Tidally Tilted Pulsations in HD 265435: a subdwawrf B Star with a Close White Dwarf Companion Open
Mesa source code for the subdwarf B star used in pulsation modeling of HD 265435.
View article: Well-being in French Astrophysics
Well-being in French Astrophysics Open
It has become clear that early career astrophysics researchers (doctoral researchers, post-docs, etc) have a very diverse appreciation of their career, with some declaring it the best job that you can have and others suffering from overwor…
View article: Discovery of 74 new bright ZZ Ceti stars in the first three years of <i>TESS</i>
Discovery of 74 new bright ZZ Ceti stars in the first three years of <i>TESS</i> Open
We report the discovery of 74 new pulsating DA white dwarf stars, or ZZ Cetis, from the data obtained by the Transiting Exoplanet Survey Satellite mission, from Sectors 1 to 39, corresponding to the first 3 cycles. This includes objects fr…