The impact of M dwarf stellar convection on exoplanetary atmospheric signatures. A 3D radiation-hydrodynamics simulation analysis for high-resolution spectroscopy

Classés selon la proximité de leur titre et de leur résumé avec ceux de cet article. Sélectionnez-en pour les lire ensemble.

Les articles les plus proches

1. Très proche Autre approche du problème Pas pertinent

   The Rossiter-McLaughlin effect reloaded: Probing the 3D spin-orbit geometry, differential stellar rotation, and the spatially-resolved stellar spectrum of star-planet systems

   H. M. Cegla, C. Lovis, V. Bourrier et al. · 2016 · A&A 588, A127 (2016) · cité 97 fois · Résumé IA disponible

   Cette étude modélise l’effet Rossiter-McLaughlin pendant un transit et reconstruit le spectre stellaire occulté, tandis que l’article examine aussi la convection et le détrendage PCA.

   Résumé scientifique

   When a planet transits its host star, it blocks regions of the stellar surface from view; this causes a distortion of the spectral lines and a change in the line-of-sight (LOS) velocities, known as the Rossiter-McLaughlin (RM) effect. Since the LOS velocities depend, in part, on the stellar rotation, the RM waveform is sensitive to the star-planet alignment (which provides information on the system's dynamical history). We present a new RM modelling technique that directly measures the spatially-resolved stellar spectrum behind the planet. This is done by scaling the continuum flux of the (HARPS) spectra by the transit light curve, and then subtracting the in- from the out-of-transit spectra…

2. Très proche Autre approche du problème Pas pertinent

   Robustness Measures for Molecular Detections using High-Resolution Transmission Spectroscopy of Exoplanets

   Connor J. Cheverall, Nikku Madhusudhan, Måns Holmberg · 2023 · Earth and Planetary Astrophysics · cité 29 fois · Résumé IA disponible

   Cette étude teste la robustesse des métriques de détrendage PCA pour des spectres de transmission proche infrarouge, comme l’article qui évalue le détrendage des signaux stellaires.

   Résumé scientifique

   Ground-based high-resolution transmission spectroscopy has emerged as a promising technique for detecting chemicals in transiting exoplanetary atmospheres. Despite chemical inferences in several exoplanets and previous robustness studies, a robust and consistent detrending method to remove telluric and stellar features from transmission spectra has yet to be agreed upon. In this work we investigate the robustness of metrics used to optimise PCA-based detrending for high-resolution transmission spectra of exoplanets in the near-infrared. As a case study, we consider observations of the hot Jupiter HD 189733 b obtained using the CARMENES spectrograph on the 3.5 m CAHA telescope. We confirm tha…

3. Proche Contexte plus large Pas pertinent

   RV-detected planets around M dwarfs: Challenges for core accretion models

   Martin Schlecker, Remo Burn, Silvia Sabotta et al. · 2022 · A&A 664, A180 (2022) · cité 29 fois · Résumé IA disponible

   Cette étude confronte des modèles de synthèse de populations planétaires aux détections en vitesse radiale autour de naines M, plutôt que d’analyser leur contamination spectroscopique.

   Résumé scientifique

   Planet formation is sensitive to the conditions in protoplanetary disks, for which scaling laws as a function of stellar mass are known. We aim to test whether the observed population of planets around low-mass stars can be explained by these trends, or if separate formation channels are needed. We address this question by confronting a state-of-the-art planet population synthesis model with a sample of planets around M dwarfs observed by the HARPS and CARMENES radial velocity (RV) surveys. To account for detection biases, we performed injection and retrieval experiments on the actual RV data to produce synthetic observations of planets that we simulated following the core accretion paradigm…

4. Proche Même question Pas pertinent

   Towards robust corrections for stellar contamination in JWST exoplanet transmission spectra

   Benjamin V. Rackham, Julien de Wit · 2023 · The Astronomical Journal (2024) 168, 82 · cité 32 fois · Résumé IA disponible

   Cette étude examine la correction de la contamination stellaire dans les spectres de transmission exoplanétaires, comme l’article qui quantifie les effets de convection et de transit.

   Résumé scientifique

   Transmission spectroscopy is still the preferred characterization technique for exoplanet atmospheres, although it presents unique challenges which translate into characterization bottlenecks when robust mitigation strategies are missing. Stellar contamination is one of such challenges that can overpower the planetary signal by up to an order of magnitude, and thus not accounting for stellar contamination can lead to significant biases in the derived atmospheric properties. Yet, accounting for stellar contamination may not be straightforward, as important discrepancies exist between state-of-the-art stellar models and measured spectra and between models themselves. Here we explore the extent…

5. Proche Article de revue Pas pertinent

   Atmospheres from very low-mass stars to extrasolar planets

   France Allard, Derek Homeier · 2012 · Solar and Stellar Astrophysics · cité 105 fois · Résumé IA disponible

   Cette revue synthétise la modélisation des atmosphères stellaires et substellaires de faible masse, dont les naines M étudiées dans l’article.

   Résumé scientifique

   Within the next few years, several instruments aiming at imaging extrasolar planets will see first light. In parallel, low mass planets are being searched around red dwarfs which offer more favorable conditions, both for radial velocity detection and transit studies, than solar-type stars. We review recent advancements in modeling the stellar to substellar transition. The revised solar oxygen abundances and cloud models allow to reproduce the photometric and spectroscopic properties of this transition to a degree never achieved before, but problems remain in the important M-L transition characteristic of the effective temperature range of characterizable exoplanets.

6. Proche Même méthode, autre problème Pas pertinent

   There's more to life than O$_2$: Simulating the detectability of a range of molecules for ground-based high-resolution spectroscopy of transiting terrestrial exoplanets

   Miles H. Currie, Victoria S. Meadows, Kaitlin C. Rasmussen · 2023 · Earth and Planetary Astrophysics · cité 10 fois · Résumé IA disponible

   Cette étude simule des spectres de transmission à haute résolution pour évaluer la détection de molécules atmosphériques, comme l’article par simulations spectroscopiques de transit.

   Résumé scientifique

   Within the next decade, atmospheric O$_2$ on Earth-like M dwarf planets may be accessible with visible--near-infrared, high spectral resolution extremely large ground-based telescope (ELT) instruments. However, the prospects for using ELTs to detect environmental properties that provide context for O$_2$ have not been thoroughly explored. Additional molecules may help indicate planetary habitability, rule out abiotically generated O$_2$, or reveal alternative biosignatures. To understand the accessibility of environmental context using ELT spectra, we simulate high-resolution transit transmission spectra of previously-generated evolved terrestrial atmospheres. We consider inhabited pre-indus…

7. Proche Contexte plus large Pas pertinent

   EDEN Survey: Small Transiting Planet Detection Limits and Constraints on the Occurrence Rates for Late M Dwarfs within 15 pc

   Jeremy Dietrich, Dániel Apai, Martin Schlecker et al. · 2023 · Earth and Planetary Astrophysics · cité 8 fois · Résumé IA disponible

   Cette étude mesure les limites de détection des petites planètes en transit autour de naines M tardives, sans traiter leur spectroscopie atmosphérique contaminée.

   Résumé scientifique

   Earth-sized exoplanets that transit nearby, late spectral type red dwarfs will be prime targets for atmospheric characterization in the coming decade. Such systems, however, are difficult to find via wide-field transit surveys like Kepler or TESS. Consequently, the presence of such transiting planets is unexplored and the occurrence rates of short-period Earth-sized planets around late M dwarfs remain poorly constrained. Here, we present the deepest photometric monitoring campaign of 22 nearby late M dwarf stars, using data from over 500 nights on seven 1-2 meter class telescopes. Our survey includes all known single quiescent northern late M dwarfs within 15 pc. We use transit-injection-and…

8. Proche Contexte plus large Pas pertinent

   Observing M Dwarfs UV and optical flares from a CubeSat and their implications for exoplanets habitability

   Julien Poyatos, Octavi Fors, José Maria Gómez Cama · 2023 · IAC-2022, B4, IP, 33, x70034 · Résumé IA disponible

   Cette étude observe les éruptions UV et optiques des naines M et leurs conséquences possibles sur l’habitabilité, plutôt que leurs signatures spectrales de transit.

   Résumé scientifique

   M dwarfs show the highest rocky planet occurrence among all spectral types, in some instances within the Habitable Zone. Because some of them are very active stars, they are often subject to frequent and powerful flaring, which can be a double-edged sword in regard of exoplanet habitability. On one hand, the increased flux during flare events can trigger the chemical reactions that are necessary to build the basis of prebiotic chemistry. On the other hand, sufficiently strong flares may erode exoplanets' atmospheres and reduce their UV protection. Recent observations of flares have shown that the flaring flux can be x100 times stronger in UV than in the optical. UV is also preferable to cons…