Search Publications
Massive Multi-Mission Statistical Study and Analytical Modeling of the Earth's Magnetopause: 2. Shape and Location
Lavraud, B.; Jeandet, A.; Aunai, N. +3 more
The Earth magnetopause is the boundary between the magnetosphere and the shocked solar wind. Its location and shape are primarily determined by the properties of the solar wind and interplanetary magnetic field (IMF) but the nature of the control parameters and to what extent they impact the stand-off distance, the flaring, and the symmetries, on …
Luminosity distribution of Type II supernova progenitors
Rodríguez, Ósmar
I present progenitor luminosities (L) for a sample of 112 Type II supernovae (SNe II), computed directly from progenitor photometry and the bolometric correction technique, or indirectly from empirical correlations between progenitor luminosity and [${\rm O\, \small {I}}$] λλ6300, 6364 line luminosity at 350 d since explosion, 56Ni mass…
Hubble WFC3 Spectroscopy of the Rocky Planet L 98-59 b: No Evidence for a Cloud-free Primordial Atmosphere
Wang, Yonghao; Zhou, Li; Ma, Bo +1 more
We are using archived data from HST of transiting exoplanet L 98-59 b to place constraints on its potentially hot atmosphere. We analyze the data from five transit visits and extract the final combined transmission spectrum using Iraclis. Then we use the inverse atmospheric retrieval code TauREx to analyze the combined transmission spectrum. There…
Planetesimals around stars with TESS (PAST) - II. An M dwarf 'dipper' star with a long-lived disc in the TESS continuous viewing zone
Gaidos, Eric; Mann, Andrew W.; Ansdell, Megan +6 more
Studies of T Tauri discs inform planet formation theory; observations of variability due to occultation by circumstellar dust are a useful probe of unresolved, planet-forming inner discs, especially around faint M dwarf stars. We report observations of 2M0632, an M dwarf member of the Carina young moving group that was observed by Transiting Exopl…
Distant Formation and Differentiation of Outer Main Belt Asteroids and Carbonaceous Chondrite Parent Bodies
Ehlmann, B. L.; Usui, F.; Kurokawa, H. +4 more
Volatile compositions of asteroids provide information on the Solar System history and the origins of Earth's volatiles. Visible to near-infrared observations at wavelengths of <2.5 µm have suggested a genetic link between outer main belt asteroids located at 2.5-4 au and carbonaceous chondrite meteorites (CCs) that show isotopic similarities t…
Structural Parameters and Possible Association of the Ultra-faint Dwarfs Pegasus III and Pisces II from Deep Hubble Space Telescope Photometry
Choi, Yumi; van der Marel, Roeland P.; Geha, Marla +17 more
We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf (UFD) galaxies Pegasus III (Peg III) and Pisces II (Psc II), two of the most distant satellites in the halo of the Milky Way (MW). We measure the structure of both galaxies, derive mass-to-light ratios with newly determined absolute magnitudes, and compare our finding…
Validation of a Wave Heated 3D MHD Coronal-wind Model using Polarized Brightness and EUV Observations
Pinto, Rui F.; Réville, Victor; Strugarek, Antoine +5 more
The physical properties responsible for the formation and evolution of the corona and heliosphere are still not completely understood. 3D MHD global modeling is a powerful tool to investigate all the possible candidate processes. To fully understand the role of each of them, we need a validation process where the output from the simulations is qua…
A bottom-up search for Lyman-continuum leakage in the Hubble Ultra Deep Field
Hayes, M.; Melinder, J.; Rivera-Thorsen, T. E.
Context. When studying the production and escape of Lyman continuum (LyC) from galaxies, it is standard to rely on an array of indirect observational tracers in the preselection of candidate leakers.
Aims: In this work, we investigate how much ionizing radiation might be missed due to these selection criteria by completely removing them and p…
Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy - III. HH 514
Henney, W. J.; Méndez-Delgado, J. E.; García-Rojas, J. +1 more
We analyse the physical conditions and chemical composition of the photoionized Herbig-Haro object HH 514, which emerges from the protoplanetary disc (proplyd) 170-337 in the core of the Orion Nebula. We use high-spectral resolution spectroscopy from Ultraviolet and Visual Echelle Spectrograph at the Very Large Telescope and IFU-spectra from MEGAR…
New Time-resolved, Multi-band Flares in the GJ 65 System with gPhoton
Brasseur, C. E.; Osten, Rachel A.; Fleming, Scott W. +2 more
Characterizing the distribution of flare properties and occurrence rates is important for understanding habitability of M-dwarf exoplanets. The Galaxy Evolution Explorer (GALEX) space telescope observed the GJ 65 system, composed of the active, flaring M stars BL Cet and UV Cet, for 15,900 s (~4.4 hr) in two ultraviolet (UV) bands. The contrast in…