Search Publications
Atmospheric properties of AF Lep b with forward modeling
Tremblin, P.; De Rosa, R. J.; Boccaletti, A. +11 more
Context. About a year ago, a super-Jovian planet was directly imaged around the nearby young solar-type star AF Lep. The 2.8 MJup planet orbiting at a semimajor axis of 8.2 au matches the predicted location based on the HIPPARCOS-Gaia astrometric acceleration.
Aims: Our aim is to expand the atmospheric exploration of AF Lep b by mo…
Revealing Callisto's Carbon-rich Surface and CO2 Atmosphere with JWST
de Pater, Imke; Roth, Lorenz; Malaska, Michael J. +18 more
We analyzed spectral cubes of Callisto's leading and trailing hemispheres, collected with the NIRSpec Integrated Field Unit (G395H) on the James Webb Space Telescope. These spatially resolved data show strong 4.25 µm absorption bands resulting from solid-state 12CO2, with the strongest spectral features at low latitudes…
ATCA study of Small Magellanic Cloud supernova remnant 1E 0102.2-7219
Haberl, F.; Hill, T.; Filipović, M. D. +29 more
We present new and archival Australia Telescope Compact Array and Atacama Large Millimeter/submillimeter Array data of the Small Magellanic Cloud supernova remnant 1E 0102.2-7219 at 2100, 5500, 9000, and 108 000 MHz; as well as H I data provided by the Australian Square Kilometre Array Pathfinder. The remnant shows a ring-like morphology with a me…
High-resolution spectroscopy of the young open cluster M 39 (NGC 7092)
Vallenari, A.; Bragaglia, A.; Frasca, A. +5 more
M 39 is a nearby young open cluster hardly studied in the last few decades. No giant is known among its members and its chemical composition has never been studied. In order to investigate it, we performed high-resolution spectroscopy of 20 expected cluster members with the HARPS and FIES spectrographs. By combining our observations with archival …
Exploring the cosmological model in f(R ,Tϕ) gravity with observational constraints
Bhardwaj, Vinod Kumar; Garg, Priyanka
We have investigated an isotropic and homogeneous cosmological model of the universe in f(R ,Tϕ) gravity, where Tϕ is the trace of the energy-momentum tensor and R is the Ricci scalar. We developed and presented exact solutions of field equations of the proposed model by taking the parametrization q(z) = α + βz/1 + z , where …
Low-amplitude Solar-like Oscillations in the K5 V Star ϵ Indi A
Butler, R. Paul; Li, Yaguang; Bedding, Timothy R. +17 more
We have detected solar-like oscillations in the mid-K-dwarf ϵ Indi A, making it the coolest dwarf to have measured oscillations. The star is noteworthy for harboring a pair of brown dwarf companions and a Jupiter-type planet. We observed ϵ Indi A during two radial velocity campaigns, using the high-resolution spectrographs HARPS (2011) and UVES (2…
Investigating the hard state of MAXI J1820 + 070: a comprehensive Bayesian approach to black hole spin and accretion properties
Vaughan, Simon; Dias, Sachin D.; Lefkir, Mehdy +1 more
We analyse the X-ray spectrum of the black hole (BH) X-ray binary MAXI J1820 + 070 using observations from XMM-Newton and NuSTAR during 'hard' states of its 2018-2019 outburst. We take a fully Bayesian approach, and this is one of the first papers to present a fully Bayesian workflow for the analysis of an X-ray binary X-ray spectrum. This allows …
Size Growth on Short Timescales of Star-forming Galaxies: Insights from Size Variation with Rest-frame Wavelength with JADES
Zhang, Hongxin; Kong, Xu; Li, Hui +11 more
We investigate size variation with rest-frame wavelength for star-forming galaxies based on the second James Webb Space Telescope Advanced Deep Extragalactic Survey data release. Star-forming galaxies are typically smaller at longer wavelengths from the UV to the near-IR at z < 3.5, especially for more massive galaxies, indicating the inside-ou…
An in-depth analysis of the differentially expanding star cluster Stock 18 (Villafranca O-036) using Gaia DR3 and ground-based data
Maíz Apellániz, J.; Sota, A.; Pantaleoni González, M. +4 more
Context. The Villafranca project is combining Gaia data with ground-based surveys to analyze Galactic stellar groups (clusters, associations, or parts thereof) with OB stars. Aims. We want to analyze the poorly studied cluster Stock 18 within the Villafranca project, as it is a very young stellar cluster with a symmetrical and compact H II region …
Recurring tidal disruption events a decade apart in IRAS F01004-2237
Buckley, David; Fan, Xiaohui; Gromadzki, Mariusz +16 more
Context. In theory, recurring tidal disruption events (TDEs) may occur when a close stellar binary encounters a supermassive black hole, if one star is captured and undergoes repeating partial TDEs, or if both stars are tidally disrupted (double TDEs). In addition, independent TDEs may be observed over decades in some special galaxies where the TD…