SN Ia 2025bvm in the Seyfert galaxy NGC 4156: Early detection and follow- up observationsстатья
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Дата последнего поиска статьи во внешних источниках: 4 марта 2026 г.
Аннотация:We investigated the photometric and spectroscopic evolution of SN Ia 2025bvmto perform a detailed classification and provide an independent distance estimate for the host galaxy NGC4156. We present UBVRI photometry for a period between days -16 and 80 relative to the B-band maximum. Six optical spectra were taken between days -3 and28. We used different fitting methods to derive the basic photometric parameters. We determined the expansion velocities from the blueshift of the SiII absorption line and the equivalent widths of the interstellar NaI lines.SN 2015bvm exhibits a photometric evolutiontypical for Type Ia supernovae; the Delta m(15) parameter and the rise time are both close to their mean values. The rising part of the light curves shows no signs of excess flux. The color curves indicate asignificant color excess of E(B-V)(tot)=0.22+-0.04 mag.The interstellar NaI lines in the host galaxy are stronger than expected for this value of dustextinction. SN2025bvm is notable for its high expansion velocityat maximum light and the presence of a plateau in the velocity temporal evolution. We estimate a distance modulus of mod=34.84+-0.10$ mag, consistent with the value derived from the host galaxy redshift.