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View article: ExoplaNeT accRetion mOnitoring sPectroscopic surveY (ENTROPY) - II. Time series of Balmer line profiles of Delorme 1(AB)b
ExoplaNeT accRetion mOnitoring sPectroscopic surveY (ENTROPY) - II. Time series of Balmer line profiles of Delorme 1(AB)b Open
Accretion processes in the planetary-mass regime remain poorly constrained, yet they strongly influence planet formation, evolution, and the composition of circumplanetary disks (CPDs). We investigate the resolved Balmer hydrogen emission-…
View article: Short- and long-term variations of the high mass accretion rate classical T Tauri star DR Tau
Short- and long-term variations of the high mass accretion rate classical T Tauri star DR Tau Open
Context. Classical T Tauri stars are newly formed, low-mass stars, which may display both periodic and random variations in their brightness. These systems are surrounded by a circumstellar disk, from which material falls onto the stellar …
View article: A dusty magnetospheric stream as the physical mechanism responsible for stellar occultations: Interpretation of the TESS light curve of the pre-transitional disk system UX Tau A
A dusty magnetospheric stream as the physical mechanism responsible for stellar occultations: Interpretation of the TESS light curve of the pre-transitional disk system UX Tau A Open
Context . Recent observations of the object UX Tau A containing a pre-transitional disk suggest that the inner disk is misaligned and precessing with respect to the outer disk. These motions lead to a highly dynamic environment that change…
View article: SPIRou observations of the young planet-hosting star PDS 70
SPIRou observations of the young planet-hosting star PDS 70 Open
This paper presents near-infrared spectropolarimetric and velocimetric observations of the young planet-hosting T Tauri star PDS 70, collected with SPIRou at the 3.6-m Canada–France–Hawaii Telescope from 2020 to 2024. Clear Zeeman signatur…
View article: L’observation exceptionnelle de la naissance d’une planète en dehors de notre système solaire
L’observation exceptionnelle de la naissance d’une planète en dehors de notre système solaire Open
View article: The interplay between disk wind and magnetospheric accretion mechanisms in the innermost environment of RU Lup
The interplay between disk wind and magnetospheric accretion mechanisms in the innermost environment of RU Lup Open
Context. Hydrogen recombination lines such as Br γ are tracers of hot gas within the inner circumstellar disk of young stellar objects (YSOs). In the relatively cool innermost environment of T Tauri stars specifically, Br γ emission is clo…
View article: Magnetic field, magnetospheric accretion, and candidate planet of the young star GM Aurigae observed with SPIRou
Magnetic field, magnetospheric accretion, and candidate planet of the young star GM Aurigae observed with SPIRou Open
This paper analyses spectropolarimetric observations of the classical T Tauri star (CTTS) GM Aurigae collected with SPIRou, the near-infrared spectropolarimeter at the Canada–France–Hawaii Telescope, as part of the SLS and SPICE Large Prog…
View article: The interplay between disk wind and magnetospheric accretion mechanisms in the innermost environment of RU Lup
The interplay between disk wind and magnetospheric accretion mechanisms in the innermost environment of RU Lup Open
Aims: Our aim is to build upon the analysis presented in our previous work by attempting to match the observational data obtained with VLTI GRAVITY for RU Lup in 2021 with an expanded radiative transfer model of Br$γ$ emission. Specificall…
View article: A dusty magnetospheric stream explaining the light curves of the dipper objects: Finding a new inclination threshold to produce dippers
A dusty magnetospheric stream explaining the light curves of the dipper objects: Finding a new inclination threshold to produce dippers Open
Context . The so-called “dippers” are young stellar objects that exhibit dimming episodes in their optical light curves. The common interpretation for the occurrence of these dips is that dusty regions periodically or quasi-periodically cr…
View article: Unraveling the binary nature of HQ Tau
Unraveling the binary nature of HQ Tau Open
Context. Both the stellar activity and the accretion processes of young stellar objects can induce variations in their radial velocity (RV). This variation is often modulated on the stellar rotation period and may hide a RV signal from a p…
View article: Unraveling the binary nature of HQ Tau: A brown dwarf companion revealed using multi-variate Gaussian process
Unraveling the binary nature of HQ Tau: A brown dwarf companion revealed using multi-variate Gaussian process Open
Context. Both the stellar activity and the accretion processes of young stellar objects can induce variations in their radial velocity (RV). This variation is often modulated on the stellar rotation period and may hide a RV signal from a p…
View article: SPIRou spectropolarimetry of the T Tauri star TW Hydrae: magnetic fields, accretion and planets
SPIRou spectropolarimetry of the T Tauri star TW Hydrae: magnetic fields, accretion and planets Open
In this paper we report near-infrared observations of the classical T Tauri star TW Hya with the SPIRou high-resolution spectropolarimeter and velocimeter at the 3.6-m Canada-France-Hawaii Telescope in 2019, 2020, 2021 and 2022. By applyin…
View article: Long-period modulation of the classical T Tauri star CI Tau
Long-period modulation of the classical T Tauri star CI Tau Open
Context . Detecting planets within protoplanetary disks around young stars is essential for understanding planet formation and evolution. However, planet detection using the radial velocity method faces challenges due to the strong stellar…
View article: Long-term monitoring of large-scale magnetic fields across optical and near-infrared domains with ESPaDOnS, Narval, and SPIRou
Long-term monitoring of large-scale magnetic fields across optical and near-infrared domains with ESPaDOnS, Narval, and SPIRou Open
Context. Dynamo models describing the generation of stellar magnetic fields for partly and fully convective stars are guided by observational constraints. Zeeman-Doppler imaging has revealed a variety of magnetic field geometries and, for …
View article: Long-term monitoring of large-scale magnetic fields across optical and near-infrared domains with ESPaDOnS, Narval and SPIRou. The cases of EV Lac, DS Leo, and CN Leo
Long-term monitoring of large-scale magnetic fields across optical and near-infrared domains with ESPaDOnS, Narval and SPIRou. The cases of EV Lac, DS Leo, and CN Leo Open
Dynamo models of stellar magnetic fields for partly and fully convective stars are guided by observational constraints. Zeeman-Doppler imaging has revealed a variety of magnetic field geometries and, for fully convective stars in particula…
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Context . The region of protoplanetary disks closest to a star (within 1–2 au) is shaped by a number of different processes, from accretion of the disk material onto the central star to ejection in the form of winds and jets. Optical and n…
View article: The GRAVITY young stellar object survey XII. The hot gas disk component in Herbig Ae/Be stars
The GRAVITY young stellar object survey XII. The hot gas disk component in Herbig Ae/Be stars Open
The region of protoplanetary disks closest to a star (within 1-2\,au) is shaped by a number of different processes, from accretion of the disk material onto the central star to ejection in the form of winds and jets. Optical and near-IR em…
View article: Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b
Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b Open
TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85 R$_J$. It orbits a low-mass pre-main sequence star (0.170 M$_\odot$, 0.56 R$_\odot$) every 27.4 days. The magneti…
View article: Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b
Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b Open
TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85 R j . It orbits a low-mass pre-main sequence star (0.170 M ⊙ , 0.56 R ⊙ ) every 27.4 days. The magnetic activity …
View article: Monitoring the young planet host V1298 Tau with SPIRou: planetary system and evolving large-scale magnetic field
Monitoring the young planet host V1298 Tau with SPIRou: planetary system and evolving large-scale magnetic field Open
We report results of a spectropolarimetric monitoring of the young Sun-like star V1298 Tau based on data collected with the near-infrared spectropolarimeter SPIRou at the Canada–France–Hawaii Telescope between late 2019 and early 2023. Usi…
View article: Twenty-five Years of Accretion onto the Classical T Tauri Star TW Hya
Twenty-five Years of Accretion onto the Classical T Tauri Star TW Hya Open
Accretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time of the mass accretion rate onto TW Hya, the nearest accret…
View article: Twenty-Five Years of Accretion onto the Classical T Tauri Star TW Hya
Twenty-Five Years of Accretion onto the Classical T Tauri Star TW Hya Open
Accretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time of the mass accretion rate onto TW Hya, the nearest accret…
View article: Star-disk interactions in the strongly accreting T Tauri star S CrA N
Star-disk interactions in the strongly accreting T Tauri star S CrA N Open
Context. Classical T Tauri stars are thought to accrete material from their surrounding protoplanetary disks through funnel flows along their magnetic field lines. The classical T Tauri stars with high accretion rates (∼10 −7 M ⊙ yr −1 ) a…
View article: Preface
Preface Open
The exoplanet revolution that began nearly three decades ago with the discovery of the first planet around a Sun-like star, has drastically changed our understanding of the formation of extra-solar systems.Today, we face an extreme diversi…
View article: Star-Planet Interactions
Star-Planet Interactions Open
Stars interact with their planets through gravitation, radiation, and magnetic fields. I shall focus on the interactions between late-type stars with an outer convection zone and close-in planets, i.e., with an orbital semimajor axis small…
View article: Modelling simultaneous <i>CoRoT</i> and <i>Spitzer</i> light curves: the impact of bending waves in the inner disc
Modelling simultaneous <i>CoRoT</i> and <i>Spitzer</i> light curves: the impact of bending waves in the inner disc Open
We present a physical interpretation of the amplitude of light curves of young stellar objects (YSOs) simultaneously observed in the infrared with the Spitzer Space Telescope and in the optical with the CoRoT satellite. The modelled object…
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Context. T Tauri stars are known to be the cradle of planet formation. Most exoplanets discovered to date lie at the very inner part of the circumstellar disk (<1 au). The innermost scale of young stellar objects is therefore a compelling …
View article: The GRAVITY young stellar object survey -- XI. Probing the inner disk and magnetospheric accretion region of CI Tau
The GRAVITY young stellar object survey -- XI. Probing the inner disk and magnetospheric accretion region of CI Tau Open
Aims: We aim at spatially and spectrally resolving the innermost scale of the young stellar object CI Tau to constrain the inner disk properties and better understand the magnetospheric accretion phenomenon. Methods: The high sensitivity o…
View article: A Survey of Herbig Ae/Be Multiplicity
A Survey of Herbig Ae/Be Multiplicity Open
Although the majority of Herbig Ae/Be (HAEBE) stars are likely multiple systems, relatively few multiples have been identified. We aim to create a statistically significant survey of HAEBE multiplicity as a function of stellar mass, to she…
View article: Spectroscopic and interferometric signatures of magnetospheric accretion in young stars
Spectroscopic and interferometric signatures of magnetospheric accretion in young stars Open
Aims. We aim to assess the complementarity between spectroscopic and interferometric observations in the characterisation of the inner star-disc interaction region of young stars. Methods. We used the MCFOST code to solve the non-local the…