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Hard X-Ray Observations of the Hydrogen-poor Superluminous Supernova SN 2018hti with NuSTAR

Andreoni, Igor and Lu, Wenbin and Grefenstette, Brian and Kasliwal, Mansi and Yan, Lin and Hare, Jeremy (2022) Hard X-Ray Observations of the Hydrogen-poor Superluminous Supernova SN 2018hti with NuSTAR. Astrophysical Journal Letters, 941 (1). Art. No. L16. ISSN 2041-8205. doi:10.3847/2041-8213/aca593.

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Some hydrogen-poor superluminous supernovae are likely powered by a magnetar central engine, making their luminosity larger than common supernovae. Although a significant amount of X-ray flux is expected from the spin-down of the magnetar, direct observational evidence is still to be found, giving rise to the “missing energy” problem. Here we present NuSTAR observations of nearby SN 2018hti 2.4 yr (rest frame) after its optical peak. We expect that, by this time, the ejecta have become optically thin for photons more energetic than ∼15 keV. No flux is detected at the position of the supernova down to F_(10–30 keV) = 9.0 × 10^(−14) erg cm^(−2) s^(−1), or an upper limit of 7.9 × 10^(41) erg s^(−1) at a distance of 271 Mpc. This constrains the fraction of bolometric luminosity from the putative spinning down magnetar to be f_X ≲ 36% in the 10–30 keV range in a conservative case, f_X ≲ 11% in an optimistic case.

Item Type:Article
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URLURL TypeDescription
Andreoni, Igor0000-0002-8977-1498
Lu, Wenbin0000-0002-1568-7461
Grefenstette, Brian0000-0002-1984-2932
Kasliwal, Mansi0000-0002-5619-4938
Yan, Lin0000-0003-1710-9339
Hare, Jeremy0000-0002-8548-482X
Additional Information:We thank the anonymous referee for the constructive review of the manuscript. We thank Cole Miller and Simone Dichiara for the useful discussions. This project was funded by NASA grant No. 80NSSC22K0063. W.L. was supported by the Lyman Spitzer, Jr. Fellowship at Princeton University. J.H. acknowledges support from an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by the ORAU through a contract with NASA.
Group:Astronomy Department
Funding AgencyGrant Number
Princeton UniversityUNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20230103-817548100.23
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ID Code:118624
Deposited By: Research Services Depository
Deposited On:27 Jan 2023 16:24
Last Modified:27 Jan 2023 16:24

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