P. Odert
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View article: Flares and superflares on the southern active binary CC Eri
Flares and superflares on the southern active binary CC Eri Open
Flares and CMEs are known to be the dominating high-energy phenomena on cool stars. Superflares were thoroughly investigated using broadband photometry predominantly from Kepler, K2, and TESS. Here we present a spectroscopic investigation …
View article: PLATOSpec: a precise spectrograph in support of space missions
PLATOSpec: a precise spectrograph in support of space missions Open
The upcoming space missions that will characterize exoplanets, such as PLATO and Ariel, will collect huge amounts of data that will need to be complemented with ground-based observations. The aim of the PLATOSpec project is to perform scie…
View article: PLATOSpec: a precise spectrograph in support of space missions
PLATOSpec: a precise spectrograph in support of space missions Open
The upcoming space missions that will characterize exoplanets, such as PLATO and Ariel, will collect huge amounts of data that will need to be complemented with ground-based observations. The aim of the PLATOSpec project is to perform scie…
View article: The evolution of PUCHEROS from a basic to a competitive tool for stellar astrophysics
The evolution of PUCHEROS from a basic to a competitive tool for stellar astrophysics Open
We present PUCHEROS+, a new spectrograph developed as an enhanced version of PUCHEROS (Pontificia Universidad Católica High Echelle Resolution Optical Spectrograph), which was the first high-resolution spectrograph built at the Pontificia …
View article: The EXO-UV program: lastest advances of experimental studies to investigate the biological impact of UV radiation on exoplanets
The EXO-UV program: lastest advances of experimental studies to investigate the biological impact of UV radiation on exoplanets Open
The EXO-UV program is an international, interdisciplinary collaboration between astrophysicists and biologists aimed at expanding the characterization of ultraviolet radiation (UVR) environments on exoplanets. This approach combines astrop…
View article: Sources of hydrogen in the primordial atmosphere of Venus
Sources of hydrogen in the primordial atmosphere of Venus Open
Context . Understanding the hydrogen content in Venus’ primordial atmosphere is crucial for comprehending the hydrodynamic escape process that shaped its atmospheric evolution. The hydrogen originated from two main sources: molecular hydro…
View article: Spectroscopic observations of flares and superflares on AU Mic
Spectroscopic observations of flares and superflares on AU Mic Open
The young active flare star AU Mic is the planet host star with the highest flare rate from Transiting Exoplanet Survey Satellite data. Therefore, it represents an ideal target for dedicated ground-based monitoring campaigns with the aim t…
View article: Spectroscopic observations of flares and superflares on AU Mic
Spectroscopic observations of flares and superflares on AU Mic Open
The young active flare star AU~Mic is the planet host star with the highest flare rate from TESS data. Therefore, it represents an ideal target for dedicated ground-based monitoring campaigns with the aim to characterize its numerous flare…
View article: An experimental study of the biological impact of a superflare on the TRAPPIST-1 planets
An experimental study of the biological impact of a superflare on the TRAPPIST-1 planets Open
In this study, we conducted experiments to assess the biological effects of high fluences of UV radiation (UVR) on the TRAPPIST-1 planetary system (planets e, f, g within the habitable zone), unlike previous estimates made by other authors…
View article: Stellar Flares, Superflares, and Coronal Mass Ejections—Entering the Big Data Era
Stellar Flares, Superflares, and Coronal Mass Ejections—Entering the Big Data Era Open
Flares, sometimes accompanied by coronal mass ejections (CMEs), are the result of sudden changes in the magnetic field of stars with high energy release through magnetic reconnection, which can be observed across a wide range of the electr…
View article: Stellar Flares, Superflares and Coronal Mass Ejections – Entering the Big Data Era
Stellar Flares, Superflares and Coronal Mass Ejections – Entering the Big Data Era Open
Flares, sometimes accompanied by coronal mass ejections (CMEs), are the result of sudden changes in the magnetic field of stars with high energy release through magnetic reconnection, which can be observed across a wide range of the electr…
View article: Stellar Flares, Superflares and Coronal Mass Ejections – Entering the Big Data Era
Stellar Flares, Superflares and Coronal Mass Ejections – Entering the Big Data Era Open
Flares, sometimes accompanied by coronal mass ejections (CMEs), are the result of sudden changes in the magnetic field of stars with high energy release through magnetic reconnection, which can be observed across a wide range of the electr…
View article: Observations and detectability of young Suns’ flaring and CME activity in optical spectra
Observations and detectability of young Suns’ flaring and CME activity in optical spectra Open
The Sun’s history is still a subject of interest to modern astrophysics. Observationally constrained rates of Coronal Mass Ejections (CMEs) of young solar analogues are still lacking, as those require dedicated monitoring. We present mediu…
View article: Observations and detectability of young Suns' flaring and CME activity in optical spectra
Observations and detectability of young Suns' flaring and CME activity in optical spectra Open
The Sun's history is still a subject of interest to modern astrophysics. Observationally constrained CME rates of young solar analogues are still lacking, as those require dedicated monitoring. We present medium resolution optical spectros…
View article: Spectroscopic characterization of superflares on solar-type stars -- a joint observing campaign
Spectroscopic characterization of superflares on solar-type stars -- a joint observing campaign Open
During the last decade numerous superflares have been detected on solar-type stars using broadband photometry from the Kepler and TESS satellites.Still the spectroscopic exploration of this high-energy phenomenon is lacking.This exploratio…
View article: On the required mass for an exoplanet to emit radio waves
On the required mass for an exoplanet to emit radio waves Open
The detection of radio emission from an exoplanet would constitute the best way to determine its magnetic field. Indeed, the presence of a planetary magnetic field is a necessary condition for radio emission via the Cyclotron Maser Instabi…
View article: Protective Effects of Halite to Vacuum and Vacuum-Ultraviolet Radiation: A Potential Scenario During a Young Sun Superflare
Protective Effects of Halite to Vacuum and Vacuum-Ultraviolet Radiation: A Potential Scenario During a Young Sun Superflare Open
Halite (NaCl mineral) has exhibited the potential to preserve microorganisms for millions of years on Earth. This mineral was also identified on Mars and in meteorites. In this study, we investigated the potential of halite crystals to pro…
View article: Escape of moderately volatile elements from protoplanets and its potential effect on habitability
Escape of moderately volatile elements from protoplanets and its potential effect on habitability Open
<p>Large planetesimals and planetary embryos ranging from several hundred to a few thousand kilometers can develop magma oceans through mutual collisions, gravitational energy, and the heating of short-lived radioactive elements. Aft…
View article: Modeling Balmer line signatures of stellar CMEs
Modeling Balmer line signatures of stellar CMEs Open
From the Sun we know that coronal mass ejections (CMEs) are a transient phenomenon, often correlated with flares. They have an impact on solar mass- and angular momentum loss, and therefore solar evolution, and make a significant part of s…
View article: The Exosphere as a Boundary: Origin and Evolution of Airless Bodies in the Inner Solar System and Beyond Including Planets with Silicate Atmospheres
The Exosphere as a Boundary: Origin and Evolution of Airless Bodies in the Inner Solar System and Beyond Including Planets with Silicate Atmospheres Open
In this review we discuss all the relevant solar/stellar radiation and plasma parameters and processes that act together in the formation and modification of atmospheres and exospheres that consist of surface-related minerals. Magma ocean …
View article: Can radio emission escape from the magnetosphere of υ Andromedae b – a new method to constrain the minimum mass of Hot Jupiters
Can radio emission escape from the magnetosphere of υ Andromedae b – a new method to constrain the minimum mass of Hot Jupiters Open
We investigate the atmospheric and magnetospheric conditions of the massive, close-in exoplanet υ Andromedae b (hereafter ups And b). In particular, we explore whether radio emission can be produced by the Cyclotron Maser Instability (CMI)…
View article: Stellar coronal mass ejections
Stellar coronal mass ejections Open
Stellar coronal mass ejections (CMEs) are a growing research field, especially during the past decade. The large number of so far detected exoplanets raises the open question for the CME activity of stars, as CMEs may strongly affect exopl…
View article: A confined dynamo: Magnetic activity of the K-dwarf component in the pre-cataclysmic binary system V471 Tauri
A confined dynamo: Magnetic activity of the K-dwarf component in the pre-cataclysmic binary system V471 Tauri Open
Context. Late-type stars in close binary systems can exhibit strong magnetic activity owing to rapid rotation supported by tidal locking. On the other hand, tidal coupling may suppress the differential rotation which is a key ingredient of…
View article: Upper limits on the CME frequency of solar-like stars
Upper limits on the CME frequency of solar-like stars Open
In the last years efforts have been made to determine parameters of stellar coronal mass ejections (CMEs), on the one hand via acquiring dedicated observing time at telescopes and on the other hand via searching data archives. Here we pres…
View article: Constraining stellar CME occurrence with optical spectroscopy
Constraining stellar CME occurrence with optical spectroscopy Open
Our knowledge on coronal mass ejections (CMEs) on stars other than the Sun is still sparse. Spectroscopic observations in the optical sometimes show asymmetrically broadened wings and/or transient extra-emissions in chromospheric lines dur…
View article: First detections of stellar coronal mass ejections through coronal dimmings
First detections of stellar coronal mass ejections through coronal dimmings Open
The authors have requested that this preprint be removed from Research Square.
View article: Escape of rock-forming volatile elements and noble gases from planetary embryos
Escape of rock-forming volatile elements and noble gases from planetary embryos Open
View article: Stellar coronal mass ejections – II. Constraints from spectroscopic observations
Stellar coronal mass ejections – II. Constraints from spectroscopic observations Open
Detections of stellar coronal mass ejections (CMEs) are still rare. Observations of strong Balmer line asymmetries during flare events have been interpreted as being caused by CMEs. Here, we aim to estimate the maximum possible Balmer line…
View article: The UV surface habitability of Proxima <i>b</i>: first experiments revealing probable life survival to stellar flares
The UV surface habitability of Proxima <i>b</i>: first experiments revealing probable life survival to stellar flares Open
We use a new interdisciplinary approach to study the UV surface habitability of Proxima b under quiescent and flaring stellar conditions. We assumed planetary atmospheric compositions based on CO2 and N2 and surface pressures from 100 to 5…
View article: A census of coronal mass ejections on solar-like stars
A census of coronal mass ejections on solar-like stars Open
Coronal mass ejections (CMEs) may have major importance for planetary and stellar evolution. Stellar CME parameters, such as mass and velocity, have yet not been determined statistically. So far only a handful of stellar CMEs has been dete…