Dorian Demars
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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: Evidence for Variable Accretion onto PDS 70 c and Implications for Protoplanet Detections
Evidence for Variable Accretion onto PDS 70 c and Implications for Protoplanet Detections Open
Understanding the processes of planet formation and accretion in young systems is essential to unraveling the initial conditions of planetary systems. The PDS 70 system, which hosts two directly imaged protoplanets, provides a unique labor…
View article: VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup System
VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup System Open
The accretion/ejection processes in T Tauri stars are fundamental to their physical evolution, while also impacting the properties and evolution of the circumstellar material at a time when planet formation takes place. To date, the charac…
View article: Characterizing accretion phenomena on planetary-mass objects
Characterizing accretion phenomena on planetary-mass objects Open
Il est clairement établi que les planètes naissent dans des disques de gaz et de poussière entourant les jeunes étoiles durant les premiers 10 millions d'années. Cependant, les processus physiques impliqués dans la formation planétaire doi…
View article: ExoplaNeT accRetion mOnitoring sPectroscopic surveY (ENTROPY)
ExoplaNeT accRetion mOnitoring sPectroscopic surveY (ENTROPY) Open
Context . Accretion among planetary mass companions is a poorly understood phenomenon, due to the lack of both observational and theoretical studies. The detection of emission lines from accreting gas giants facilitates detailed investigat…
View article: Exoplanet accretion monitoring spectroscopic survey (ENTROPY) I. Evidence for magnetospheric accretion in the young isolated planetary-mass object 2MASS J11151597+1937266
Exoplanet accretion monitoring spectroscopic survey (ENTROPY) I. Evidence for magnetospheric accretion in the young isolated planetary-mass object 2MASS J11151597+1937266 Open
Accretion among planets is a poorly understood phenomenon, due to lack of both observational and theoretical studies. Detection of emission lines from accreting gas giants facilitate detailed investigations into this process. This work pre…
View article: VLT/MUSE detection of accretion-ejection associated with the close stellar companion in the HT Lup system
VLT/MUSE detection of accretion-ejection associated with the close stellar companion in the HT Lup system Open
The accretion/ejection processes in T-Tauri stars are fundamental to their physical evolution, while also impacting the properties and evolution of the circumstellar material at a time when planet formation takes place. To this date, chara…
View article: Emission line variability of young 10–30 <i>M</i><sub>Jup</sub> companions
Emission line variability of young 10–30 <i>M</i><sub>Jup</sub> companions Open
Context. Emission lines that are indicative of active accretion have been observed for a number of low-mass companions ( M < 30 M Jup ) to stars. Line variability is ubiquitous on stellar accretors, but it has never been characterized in d…
View article: Emission line variability of young 10-30 Mjup companions : I. The case of GQ Lup b and GSC 06214-00210 b
Emission line variability of young 10-30 Mjup companions : I. The case of GQ Lup b and GSC 06214-00210 b Open
Emission lines indicative of active accretion have been seen on a handful of low-mass companions (M < 30 MJup) to stars. Line variability is ubiquitous on stellar accretors but has never been characterized in detail on low-mass companions …