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  1. Discovery of quasar variability and early accretion disk signatures at cosmic dawn

    Publication
    In the nearby universe, quasars are well known to exhibit variability in their brightness over time, offering a powerful tool to probe the physics of accretion onto the …

  2. The Rise of the Black Hole X-Ray Binary AT 2019wey Observed with TESS

    Publication
    Black hole X-ray binaries (BHXRBs) have traditionally been discovered by X-ray surveys with cadences of hours to days. However, large optical time-domain surveys now provide …

  3. SPHEREx as a Frontier for Infrared Transients: Classification of New Galactic FU Ori Outbursts and Classical Novae

    Publication
    We demonstrate proof-of-concept of a new strategy for studying infrared (IR) transients enabled by the newly launched SPHEREx space mission, by leveraging its synergy with the …

  4. Fading into Darkness: A Weak Mass Ejection and Low-efficiency Fallback Accompanying Black Hole Formation in M31-2014-DS1

    Publication
    Stellar-mass black holes (BHs) can form from the near-complete collapse of massive stars, causing them to abruptly disappear. The star M31-2014-DS1 in the Andromeda …

  5. Hot Springs and Dust Reservoirs: JWST Reveals the Dusty, Molecular Aftermath of Extragalactic Stellar Mergers

    Publication
    We present James Webb Space Telescope (JWST) observations of four Luminous Red Novae (LRNe): dusty, extragalactic transients from stellar mergers following common-envelope evolution (CEE) in massive binary …

  6. AT2019cmw: a highly luminous, cooling featureless TDE candidate from the disruption of a high mass star in an early-type galaxy

    Publication
    We present optical/UV photometric and spectroscopic observations, as well as X-ray and radio follow-up, of the extraordinary event AT2019cmw. With a peak bolometric luminosity of …

  7. Testing the Association of Supermassive Black Hole Infrared Flares and High-energy Neutrinos

    Publication
    The physical origin of the observed cosmic neutrinos remains an open question and the subject of active research. While matter accretion onto supermassive black holes is long thought …

  8. Multicolor Characterization of Optically Invisible FU Orionis-type Outbursts: Demonstration and Prospects for the WINTER Survey

    Publication
    Episodic mass accretion is the dominant mechanism for mass assembly in the proto-stellar phase. Although prior optical time-domain searches have allowed detailed studies of individual outbursts …

  9. Disappearance of a massive star in the Andromeda Galaxy due to formation of a black hole

    Publication
    When a massive star reaches the end of its lifetime, its core collapses and releases neutrinos that drive a shock into the outer layers (stellar envelope). A sufficiently …

  10. Dynamical binary interactions in the 2040s

    Publication
    Dynamical binary interactions such as common envelope (CE) evolution or stellar mergers are a critical phase in the formation of a wide variety of binary phenomena, ranging from …

  11. Peculiar SN Ic 2022esa: An explosion of a massive Wolf-Rayet star in a binary as a precursor to a BH-BH binary?

    Publication
    A class of supernovae (SNe) termed `SN Ic-CSM' are characterized by late-time emergence of narrow emission lines of elements formed in the oxygen core of a …

  12. The slow brightening of WNTR23bzdiq / WTP19aalzlk : Possible onset of common-envelope evolution in an asymptotic giant branch star?

    Publication
    We present WNTR23bzdiq/WTP19aalzlk, a slow eruption of an early-asymptotic giant branch (AGB) star in M31 identified by the Wide-field Infrared Transient Explorer (WINTER) near-infrared …

  13. Characterizing the Host Galaxies and Delay Times of Ca-rich Gap Transients versus 91bg-like SNe and Normal Type Ia SNe

    Publication
    Calcium-rich gap transients are a faint, fast-evolving class of supernovae that show strong nebular Ca emission lines. Their progenitor systems are uncertain, but they are often …

  14. A Spectral Library and Census of Near-infrared Stellar Large-amplitude Variables from Palomar Gattini-IR

    Publication
    We present a near-infrared census of stellar large-amplitude variables (LAVs) observed by the Palomar Gattini-IR (PGIR) surveyor from 2019─2021. Over the three-year time period …

  15. Radio Variability in Recently Quenched Galaxies: The Impact of Tidal Disruption Event or Active Galactic Nucleus-Driven Outflows

    Publication
    Outflows and jets launched from the nuclei of galaxies emit radio synchrotron emission that can be used to study the impact of accretion energy on the host galaxy …

  16. JWST's First View of Tidal Disruption Events: Compact, Accretion-driven Emission Lines and Strong Silicate Emission in an Infrared-selected Sample

    Publication
    Mid-infrared (MIR) emission from tidal disruption events (TDEs) is a powerful probe of the circumnuclear environment around dormant supermassive black holes. This emission arises from the reprocessing …

  17. Cryoscope: A Cryogenic Infrared Survey Telescope in Antarctica

    Publication
    We present Cryoscope, a new 50 deg\(^{2}\) field-of-view, 1.2 m aperture, K\(_{\rm dark}\) survey telescope to be located at Dome C, Antarctica. Cryoscope …

  18. Collapsars as Sites of r-process Nucleosynthesis: Systematic Photometric Near-infrared Follow-up of Type Ic-BL Supernovae

    Publication
    One of the open questions following the discovery of GW170817 is whether neutron star (NS) mergers are the only astrophysical sites capable of producing r-process elements. Simulations …