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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…
Simulating Self-lensing and Eclipsing Signals due to Detached Compact Objects in the TESS Light Curves
Afshordi, Niayesh; Sajadian, Sedighe
A fraction of Galactic stars have compact companions that could be white dwarfs (WDs), neutron stars (NSs), or stellar-mass black holes (SBHs). In a detached and edge-on binary system including a main-sequence star and a compact object (denoted by WD main-sequence (WDMS), NS main-sequence (NSMS), and SBH main-sequence (BHMS) systems), the stellar …
GHOST commissioning science results - III. Characterizing an iron-poor damped Lyman α system
Simpson, Chris; Hayes, Christian R.; Sestito, Federico +20 more
The Gemini High-resolution Optical SpecTrograph (GHOST) is a new Echelle spectrograph available on the Gemini-South telescope as of Semester 2024A. We present the first high-resolution spectrum of the quasar J1449-1227 (redshift zem = 3.27) using data taken during the commissioning of GHOST. The observed quasar hosts an intervening iron…
Deciphering Martian Flood Infiltration Processes at Hebrus Valles: Insights From Laboratory Experiments and Remote Sensing Observations
Séjourné, A.; Kargel, J. S.; Costard, F. +2 more
In evaluating the unique geomorphology of Hebrus Valles on Mars, an outflow channel southeast of Utopia Planitia, we investigated the role of fluvial dynamics in forming subsurface conduits. Unlike typical Martian channels that terminate under younger sediment rocks, Hebrus Valles retains its downstream features, thus offering a window into surfac…
Resolving a Candidate Dual Active Galactic Nucleus with ∼100 pc Separation in MCG-03-34-64
Turner, T. J.; Kraemer, S. B.; Braito, V. +4 more
We report the serendipitous multiwavelength discovery of a candidate dual black hole system with a separation of ∼100 pc, in the gas-rich luminous infrared galaxy MCG-03-34-64 (z = 0.016). Hubble Space Telescope/Advanced Camera for Surveys observations show three distinct optical centroids in the [O III] narrow-band and F814W images. Subsequent an…
Two mini-Neptunes transiting the adolescent K-star HIP 113103 confirmed with TESS and CHEOPS
Pallé, E.; Zhang, H.; Winn, J. N. +31 more
We report the discovery of two mini-Neptunes in near 2:1 resonance orbits (P = 7.610303 d for HIP 113103 b and P = 14.245651 d for HIP 113103 c) around the adolescent K-star HIP 113103 (TIC 121490076). The planet system was first identified from the TESS mission, and was confirmed via additional photometric and spectroscopic observations, includin…
Combined JWST–MUSE Integral Field Spectroscopy of the Most Luminous Quasar in the Local Universe, PDS 456
Veilleux, Sylvain; Zakamska, Nadia L.; Liu, Weizhe +5 more
Fast accreting, extremely luminous quasars contribute heavily to the feedback process within galaxies. While these systems are most common at cosmic noon (z ∼ 2), here we choose to study PDS 456, an extremely luminous (L bol ∼ 1047 erg s‑1) but nearby (z ∼ 0.185) quasar where the physics of feedback can be studied …
Magnetic fields and electric currents around the dayside magnetopause as inferred from data-constrained modeling
Semenov, V. S.; Erkaev, N. V.; Tsyganenko, N. A. +1 more
Based on a new mathematical framework and large multi-year multi-mission data sets, we reconstruct electric currents and magnetic fields around the dayside magnetopause and their dependence on the incoming solar wind, IMF, and geodipole tilt. The model architecture builds on previously developed mathematical frameworks and includes two separate bl…