The MOST Hosts Survey: spectroscopic observation of the host galaxies of ~40,000 transients using DESI

• DOI: 10.48550/arxiv.2405.03857
• Publication Date: 2024-05-06
• Authors: Maayane T. Soumagnac; P. Nugent; R. A. Knop; Anna Y. Q. Ho; William Hohensee; Autumn Awbrey; Alexis Andersen; Greg Aldering; Matan Ventura; J. Aguilar; S. P. Ahlen; Segev Y. Benzvi; D. Brooks; Dillon Brout; T. Claybaugh; T. M. Davis; Kyle Dawson; Axel de la Macorra; Arjun Dey; Biprateep Dey; Peter Doel; Kelly A. Douglass; J. E. Forero-Romero; E. Gaztañaga; Satya Gontcho A G...; Or Graur; J. Guy; ChangHoon Hahn; K. Honscheid; Cullan Howlett; Alex Kim; Theodore Kisner; A. Kremin; A. Lambert; Martin Landriau; Dustin Lang; L. Le Guillou; Marc Manera; Aaron M. Meisner; R. Miquel; John Moustakas; Adam D. Myers; Jundan Nie; A. Palmese; David Parkinson; Claire Poppett; Francisco Prada; Fei Qin; Mehdi Rezaie; Graziano Rossi; E. Sánchez; David D. Schlegel; M. Schubnell; J. Silber; G. Tarlé; Benjamin A. Weaver; Zhimin Zhou
• Keywords: Transient (computer programming)

We present the MOST Hosts survey (Multi-Object Spectroscopy of Transient Hosts). The is planned to run throughout five years operation Dark Energy Spectroscopic Instrument (DESI) and will generate a spectroscopic catalog hosts most transients observed date, in particular all supernovae by public, untargeted, wide-field, optical surveys (PTF/iPTF, SDSS II, ZTF, DECAT, DESIRT). Scientific questions for which be useful include Type Ia supernova cosmology, fundamental plane peculiar velocity measurements, understanding correlations between their host galaxy properties. Here, we first release survey: 21,931 20,235 transients. These numbers represent 36% final sample, consisting 60,212 potential galaxies 38,603 (a transient can assigned multiple hosts). Of these galaxies, 40% do not appear DESI primary target list therefore require specific program like Hosts. list, only 26.7% have existing classifications, so provide redshifts (and luminosities) nearly 30,000 A preliminary Hubble diagram luminosity-duration are shown as examples future uses survey. also training sample spectroscopically photometry-only classifiers, enter an era when newly lack classification. data released through Wiserep platform on rolling cadence updated match releases. Dates releases updates available https://mosthosts.desi.lbl.gov website.