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We present panchromatic observations and modeling of calcium-strongsupernovae (SNe) 2021gno in the star-forming host galaxy NGC 4165 (D = 30.5Mpc) and 2021inl in the outskirts of elliptical galaxy NGC 4923 (D = 80 Mpc),both monitored through the Young Supernova Experiment (YSE) transient survey.The multi-color light curves of both SNe show two peaks, the former peak beingderived from shock cooling emission (SCE) and/or shock interaction withcircumstellar material (CSM). The primary peak in SN 2021gno is coincident withluminous, rapidly decaying X-ray emission ($L_x = 5 \times 10^{41}$ ergs$^{-1}$) detected by Swift-XRT at $\delta t = 1$ day after explosion, thisobservation being the second ever detection of X-rays from a calcium-strongtransient. We interpret the X-ray emission from SN 2021gno in the context ofshock interaction with dense CSM that extends to $r < 3 \times 10^{14}$ cm.Based on modeling of the SN 2021gno X-ray spectrum, we calculate a CSM massrange of $M_{\rm CSM} = (0.3 - 1.6) \times 10^{-3}$ M$_{\odot}$ and particledensities of $n = (1-4) \times 10^{10}$ cm$^{-3}$. Radio non-detections of SN2021gno indicate a low-density environment at larger radii ($r > 10^{16}$ cm)and a progenitor mass loss rate of $\dot{M} < 10^{-4}$ M$_{\odot}$ yr$^{-1}$,for $v_w = 500$ km s$^{-1}$. For radiation derived from SCE, modeling of theprimary light curve peak in both SNe indicates an extended progenitor envelopemass and radius of $M_e = 0.02 - 0.05$ M$_{\odot}$ and $R_e = 30 - 230$R$_{\odot}$. The explosion properties of SNe 2021gno and 2021inl suggestprogenitor systems containing either a low-mass massive star or a white dwarf(WD), the former being unlikely for either object given the lack of starformation at both explosion sites. Furthermore, the progenitor environments ofboth SNe are consistent with explosion models for low-mass hybrid He/C/O WD +C/O WD binaries.

The Circumstellar Environments of Double-Peaked, Calcium-strong Supernovae 2021gno and 2021inl