Search Publications
Hierarchical Bayesian inference of globular cluster properties
Speagle, Joshua S.; Webb, Jeremy J.; Eadie, Gwendolyn M. +1 more
We present a hierarchical Bayesian inference approach to estimating the structural properties and the phase-space centre of a globular cluster (GC) given the spatial and kinematic information of its stars based on lowered isothermal cluster models. As a first step towards more realistic modelling of GCs, we built a differentiable, accurate emulato…
TOI-1199 b and TOI-1273 b: Two new transiting hot Saturns detected and characterized with SOPHIE and TESS
Deleuil, M.; Moutou, C.; Narita, N. +41 more
We report the characterization of two planet candidates detected by the Transiting Exoplanet Survey Satellite (TESS), TOI-1199 b and TOI-1273 b, with periods of 3.7 and 4.6 days, respectively. Follow-up observations for both targets, which include several ground-based light curves, confirmed the transit events. High-precision radial velocities fro…
Characterizing B stars from Kepler/K2 Campaign 11. Optical analysis and seismic diagnostics
Eidam, Jéssica M.; Andrade, Laerte; Emilio, Marcelo +5 more
Aims: In this study, we analyze 122 B-type star candidates observed during Campaign 11 of the Kepler/K2 mission to investigate their variability and pulsation characteristics. A subset of 45 B star candidates was observed during the Kepler/K2 mission's Campaign 11 between September and December 2016. Our analyses aim to gain a deeper understa…
Evidence for Dust Depletion in a Misaligned Protoplanetary Disk with JWST
Zhu, Z.; Reynolds, M.; Calvet, N. +12 more
Here we report the detection of dust depletion in a misaligned inner disk around UX Tau A using JWST MIRI spectra. Mid-infrared (MIR) continuum "seesaw" variability was detected in this disk by Spitzer and attributed to variable shadows cast on the outer disk by the inner disk. The JWST MIRI spectrum of UX Tau A also shows seesaw variability but w…
Discovery of an extended horizontal branch in the Large Magellanic Cloud globular cluster NGC 1835
Vesperini, Enrico; Cadelano, Mario; Pallanca, Cristina +6 more
We present a high-angular-resolution multi-wavelength study of the massive globular cluster NGC 1835 in the Large Magellanic Cloud. Thanks to a combination of optical and near-ultraviolet images acquired with the WFC3 on board the HST, we performed a detailed inspection of the stellar population in this stellar system, adopting a `UV-guided search…
Constraints on the z ∼ 5 Star-forming Galaxy Luminosity Function From Hubble Space Telescope Imaging of an Unbiased and Complete Sample of Long Gamma-Ray Burst Host Galaxies
Strader, Jay; Perley, Daniel A.; Chornock, Ryan +4 more
We present rest-frame UV Hubble Space Telescope imaging of the largest and most complete sample of 23 long-duration gamma-ray burst (GRB) host galaxies between redshifts 4 and 6. Of these 23, we present new WFC3/F110W imaging for 19 of the hosts, which we combine with archival WFC3/F110W and WFC3/F140W imaging for the remaining four. We use the ph…
Cosmic-Ray Transport in the Presence of a Fisk-type Heliospheric Magnetic Field: Investigating the Influence of Drift
Engelbrecht, N. E.; Steyn, P. J.; Troskie, J. S.
Drifts due to the gradients in, and curvatures of, the heliospheric magnetic field (HMF) play a significant role in the transport of galactic cosmic rays (GCRs) in the heliosphere. Although this has been well studied for the Parker HMF, the influence of Fisk-type fields, with their unique geometry, has hitherto received less attention. Here, drift…
A Contact Binary Misclassified as an Ellipsoidal Variable: Complications for Detached Black Hole Searches
Strader, Jay; Bahramian, Arash; Orosz, Jerome A. +3 more
Identifying sources exhibiting ellipsoidal variability in large photometric surveys is becoming a promising method to search for candidate detached black holes (BHs) in binaries. This technique aims to exploit the orbital-phase-dependent modulation in optical photometry caused by the BH distorting the shape of the luminous star to constrain the ma…
Freezing-in cannibal dark sectors
Hryczuk, Andrzej; Cervantes, Esau
Self-Interacting Dark Matter models can successfully explain dark matter (DM) production through interactions confined within the dark sector. However, they often lack measurable experimental signals due to their secluded nature. Including a feeble interaction with the visible sector through a Higgs portal leads not only to potential detection ave…
Retrieving Young Cloudy L Dwarfs: A Nearby Planetary-mass Companion BD+60 1417B and its Isolated Red Twin W0047
Gonzales, Eileen C.; Faherty, Jacqueline K.; Morley, Caroline V. +12 more
We present an atmospheric retrieval analysis on a set of young, cloudy, red L dwarfs—CWISER J124332.12+600126.2 (BD+60 1417B) and WISEP J004701.06+680352.1 (W0047)—using the Brewster retrieval framework. We also present the first elemental abundance measurements of the young K-dwarf (K0) host star, BD+60 1417, using high-resolution (R = 50,000) sp…