Search Publications
Strong H2O and CO Emission Features in the Spectrum of KELT-20b Driven by Stellar UV Irradiation
Deming, Drake; Sing, David K.; Fu, Guangwei +7 more
Know thy star, know thy planetary atmosphere. Every exoplanet with atmospheric measurements orbits around a star, and the stellar environment directly affects the planetary atmosphere. Here we present the emission spectrum of ultra-hot Jupiter KELT-20b which provides an observational link between host-star properties and planet atmospheric thermal…
The RapidXMM upper limit server: X-ray aperture photometry of the XMM-Newton archival observations
Georgakakis, A.; Georgantopoulos, I.; Kretschmar, P. +4 more
This paper presents the construction of the RapidXMM database that is available through the XMM-Newton Science Archive and offers access to upper limits and aperture photometry across the field of view of the XMM-Newton Pointed and Slew Survey observations. The feature of RapidXMM is speed. It enables the fast retrieval of X-ray upper limits and p…
Gaia-ESO Survey: Role of magnetic activity and starspots on pre-main-sequence lithium evolution
Gilmore, G.; Montes, D.; de Laverny, P. +24 more
Context. It is now well-known that pre-main-sequence models with inflated radii should be taken into account to simultaneously reproduce the colour-magnitude diagram and the lithium depletion pattern observed in young open star clusters.
Aims: We tested a new set of pre-main-sequence models that include radius inflation due to the presence of…
Sculpting the Sub-Saturn Occurrence Rate via Atmospheric Mass Loss
Lee, Eve J.; Hallatt, Tim
The sub-Saturn (~4-8 R ⊕) occurrence rate rises with orbital period out to at least ~300 days. In this work we adopt and test the hypothesis that the decrease in their occurrence toward the star is a result of atmospheric mass loss, which can transform sub-Saturns into sub-Neptunes (≲4 R ⊕) more efficiently at shorter periods…
Modeling the Hα and He 10830 Transmission Spectrum of WASP-52b
Yan, Dongdong; Seon, Kwang-il; Guo, Jianheng +2 more
Escaping atmosphere has been detected by the excess absorption of Lyα, Hα and He triplet (λ10830) lines. Simultaneously modeling the absorption of the Hα and He λ10830 lines can provide useful constraints about the exoplanetary atmosphere. In this paper, we use a hydrodynamic model combined with a non-local thermodynamic model and a new Monte Carl…
Linking a universal gas density profile to the core-excised X-ray luminosity in galaxy clusters up to z ∼ 1.1
Arnaud, M.; Pratt, G. W.; Maughan, B. J. +1 more
We investigate the regularity of galaxy cluster gas density profiles and the link to the relation between core-excised luminosity, LXc, and mass from the YX proxy, MYX, for 93 objects selected through their Sunyaev-Zeldovich effect (SZE) signal. The sample spans a mass range of M500 = [0.5−20]…
21 new long-term variables in the GX 339-4 field: two years of MeerKAT monitoring
Heywood, I.; Wijers, R. A. M. J.; Woudt, P. A. +14 more
We present 21 new long-term variable radio sources found commensally in 2 yr of weekly MeerKAT monitoring of the low-mass X-ray binary GX 339-4. The new sources are vary on time-scales of weeks to months and have a variety of light-curve shapes and spectral index properties. Three of the new variable sources are coincident with multiwavelength cou…
New Constraints on the Future Evaporation of the Young Exoplanets in the V1298 Tau System
Sozzetti, A.; Micela, G.; Damasso, M. +7 more
Transiting planets at young ages are key targets for improving our understanding of the evolution of exo-atmospheres. We present results of a new X-ray observation of V 1298 Tau with XMM-Newton, aimed to determine more accurately the high-energy irradiation of the four planets orbiting this pre-main-sequence star, and the possible variability due …
Stellar mass segregation as separating classifier between globular clusters and ultrafaint dwarf galaxies
Hilker, M.; Baumgardt, H.; Faller, J. +2 more
We have determined the amount of stellar mass segregation in over 50 globular clusters and ultrafaint dwarf galaxy candidates based on deep HST- and ground-based photometry. We find that the amount of mass segregation in globular clusters is strongly correlated with their relaxation time and that all clusters with relaxation times of the order of …
Identifying blue large amplitude pulsators from Gaia DR2 and ZTF DR3
Lam, Marco C.; McWhirter, Paul Ross
Blue large amplitude pulsators (BLAPs) are hot, subluminous stars undergoing rapid variability with periods of under 60 min. They have been linked with the early stages of pre-white dwarfs and hot subdwarfs. They are a rare class of variable star due to their evolutionary history within interacting binary systems and the short time-scales relative…