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AT2025ulz and S250818k: Leveraging DESI Spectroscopy in the Hunt for a Kilonova Associated with a Subsolar-mass Gravitational-wave Candidate

  • Authors: Xander J. Hall, Antonella Palmese, Brendan O'Connor, Daniel Gruen, Malte Busmann, Julius Gassert, Lei Hu, Ignacio Magaña Hernandez, Jessica Nicole Aguilar, Ariel Amsellem, Steven Ahlen, John Banovetz, Segev BenZvi, Davide Bianchi, David Brooks, Francisco Javier Castander, Todd Claybaugh, Andrei Cuceu, Arjun Dey, Peter Doel, Jennifer Fabà-Moreno, Simone Ferraro, Andreu Font-Ribera, Jaime E. Forero-Romero, Gaston Gutierrez, Laurent Le Guillou, Dick Joyce, Theodore Kisner, Anthony Kremin, Ofer Lahav, Claire Lamman, Martin Landriau, Michael Levi, Axel de la Macorra, Marc Manera, Aaron Meisner, Ramon Miquel, John Moustakas, Seshadri Nadathur, Francisco Prada, Ignasi Pérez-Ràfols, Graziano Rossi, Eusebio Sanchez, David Schlegel, Michael Schubnell, David Sprayberry, Gregory Tarlé, Benjamin Alan Weaver, Rongpu Zhou, Hu Zou

Xander J. Hall et al 2026 The Astrophysical Journal Letters 1001 .

  • Provider: AAS Journals

Caption: Figure 3.

The best-fit host galaxy SED derived using prospector (B. D. Johnson et al. 2019). Model photometry is shown as orange squares and compared to the observed photometry (black circles). The top panel shows the residuals compared to the best-fit SED (red line).

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