Spectroscopy of the supernova H0pe host galaxy at redshift 1.78
Ryan, R. E.;
Yun, M. S.;
Dole, H.;
Zitrin, A.;
Kelly, P.;
Koekemoer, A. M.;
Fontana, A.;
Kamieneski, P.;
Harrington, K.;
Nonino, M.;
Coe, D.;
Thompson, D.;
Willner, S. P.;
Conselice, C. J.;
Grogin, N. A.;
Hathi, N. P.;
Polletta, M.;
Willmer, C. N. A.;
Gargiulo, A.;
Bisogni, S.;
Yan, H.;
Rutkowski, M. J.;
Mancini, C.;
Furtak, L. J.;
Jansen, R. A.;
Pirzkal, N.;
Pierel, J. D. R.;
Driver, S. P.;
Lehnert, M.;
Frye, B.;
Windhorst, R. A.;
D'Silva, J. C. J.;
Summers, J.;
Robotham, A.;
Dai, L.;
Cohen, S. H.;
Cheng, C.;
Tompkins, S.;
Marshall, M. A.;
Pascale, M.;
Foo, N.;
Garuda, N.;
Leimbach, R.;
Diego, J.;
Snigula, J. M.
Italy, United States, France, China, United Kingdom, Spain, Australia, Israel, Chile, Canada, Germany
Abstract
Supernova (SN) H0pe was discovered as a new transient in James Webb Space Telescope (JWST) NIRCam images of the galaxy cluster PLCK G165.7+67.0 taken as part of the Prime Extragalactic Areas for Reionization and Lensing Science (PEARLS) JWST GTO program (ID 1176) on 2023 March 30. The transient is a compact source associated with a background galaxy that is stretched and triply imaged by the strong gravitational lensing of the cluster. This paper reports spectra in the 950-1370 nm observer frame of two of the galaxy images obtained with Large Binocular Telescope (LBT) Utility Camera in the Infrared (LUCI) in long-slit mode two weeks after the JWST observations. The individual and average spectra show the [O II] λλ3727,3730 doublet and the Balmer and 4000 Å breaks at redshift z = 1.783 ± 0.002. The code investigating galaxy emission (CIGALE) best-fit model of the spectral energy distribution indicates that the host galaxy of SN H0pe is massive (Mstar ≃ 6 × 1010 M⊙ after correcting for a magnification factor μ ∼ 7) with a predominantly intermediate-age (∼2 Gyr) stellar population, moderate extinction, and a magnification-corrected star formation rate ≃13 M⊙ yr−1, consistent with being below the main sequence of star formation. These properties suggest that H0pe might be a type Ia SN. Additional observations of SN H0pe and its host recently carried out with JWST (JWST-DD-4446; PI: B. Frye) will be able to both determine the SN classification and confirm its association with the galaxy analyzed in this work.
2023
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Astronomy and Astrophysics
JWST
eHST
13
