J/ApJ/909/176ivo://CDS.VizieR/J/ApJ/909/176doi:10.26093/cds/vizier.19090176CDSZeng X.Wang X.Esamdin A.Pellegrino C.Zheng W.Zhang J.Mo J.,Li W.Howell D.A.Filippenko A.V.Lin H.Brink T.G.Baron E.A.,Burke J.DerKacy J.M.McCully C.Hiramatsu D.Hosseinzadeh G.,Jeffers B.T.Ross T.W.Stahl B.E.Stegman S.Valenti S.Wang L.,Xiang D.Zhang J.Zhang T.2023-02-28T07:31:03Z2022-09-12T12:46:02ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomybroad-band-photometryspectroscopyWe present extensive, well-sampled optical and ultraviolet photometry and optical spectra of the Type Ia supernova (SN Ia) 2017hpa. The light curves indicate that SN 2017hpa is a normal SN Ia with an absolute peak magnitude of M_max_^B^~-19.12+/-0.11mag and a postpeak decline rate {Delta}m_15_(B)=1.02+/-0.07mag. According to the quasi-bolometric light curve, we derive a peak luminosity of 1.25x10^43^erg/s and a ^56^Ni mass of 0.63+/-0.02M_{sun}_. The spectral evolution of SN 2017hpa is similar to that of normal Ia supernovae (SNe Ia), while it exhibits an unusually rapid velocity evolution resembling that of SN 1991bg-like SNe Ia or the high- velocity subclass of SNe Ia, with a postpeak velocity gradient of ~130+/-7km/s/d. Moreover, its early spectra (t{<}-7.9d) show a prominent CII{lambda}6580 absorption feature, which disappeared in near-maximum-light spectra but reemerged at phases from t~+8.7d to t~+11.7d after maximum light. This implies that some unburned carbon may mix deep into the inner layer and is supported by the low CII{lambda}6580-to-SiII{lambda}6355 velocity ratio (~0.81) observed in SN 2017hpa. The OI{lambda}7774 line shows a velocity distribution like that of carbon. The prominent carbon feature, the low velocity seen in carbon and oxygen, and the large velocity gradient make SN 2017hpa stand out from other normal SNe Ia and are more consistent with predictions from a violent merger of two white dwarfs. Detailed modeling is still needed to reveal the nature of SN 2017hpa.2021ApJ...909..176Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/909/176CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/183 : UBVRI Photometric Standards (Landolt 1992)VIII/77 : HI spectral properties of galaxies (Springob+, 2005)J/ApJ/645/488 : SN type Ia luminosities (Wang+, 2006)J/A+A/471/527 : Spectroscopy of SN 2005cf (Garavini+, 2007)J/MNRAS/377/1531 : Optical & IR photometry of SN 2004eo (Pastorello+, 2007)J/ApJ/699/L139 : Spectral parameters of SNe Ia (Wang+, 2009)J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)J/ApJ/742/89 : Relations between sp. and colors of SNe Ia (Foley+, 2011)J/MNRAS/410/585 : SN 2009dc BVRI light curves (Silverman+, 2011)J/AJ/143/126 : Sp. of 462 nearby Type Ia supernovae (Blondin+, 2012)J/ApJ/745/74 : Pre-maximum spectra of type Ia SNe (Folatelli+, 2012)J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/MNRAS/425/1819 : Berkeley supernova Ia program. II. (Silverman+, 2012)J/other/NewA/20.30 : BVRI light curves of 3 SN (Munari+, 2013)J/other/Sci/340.170 : Classifications of 188 SNe Ia (Wang+, 2013)J/A+A/568/A22 : Joint analysis of SDSS-II & SNLS SNe Ia (Betoule+, 2014)J/MNRAS/444/3258 : Velocities and EW of PTF SNe Ia (Maguire+, 2014)J/MNRAS/452/4307 : From optical to IR photometry of SN 2013dy (Pan+, 2015)J/MNRAS/451/1973 : Type Ia SNe igh-velocity features (Silverman+, 2015)J/ApJS/220/20 : Si and Ca high-velocity features in SNe Ia (Zhao+, 2015)J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)J/AJ/151/125 : Optical and UV photometry of SN 2013dy (Zhai+, 2016)J/ApJ/869/56 : Updated calibration of CSP-I SNe Ia sample (Burns+, 2018)J/ApJ/877/152 : UV-NIR light curves of type Ia SN 2017erp (Brown+, 2019)J/ApJ/882/120 : CfA, CSP, BSP & LOSS sp. & phot. of SNe Ia (Wang+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/909/176https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/909/176http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/909/176https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/909/176https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/909/176http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/909/176GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.762881831355591e-19 3.3785437584409506e-19OpticalInfrareddefaultJ/ApJ/909/176/table2Photometric observations of SN 2017hpa by ground-based telescopesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58053.34/58210.16] Modified Julian Date of observation (JD-2400000.5)dtime.epochdoubleEpoch[-13.3/143.52] Epoch (1)dtime.epochfloatBmag[15.42/20.3]? B-band AB magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.012/0.5]? Uncertainty in Bmagmagstat.error;phot.magfloatnullableVmag[15.32/20]? V-band AB magnitudemagphot.mag;em.opt.VfloatnullableRmag[15.25/20.51]? R-band AB magnitudemagphot.mag;em.opt.Rfloatnullablee_Vmag[0.008/0.5]? Uncertainty in Vmagmagstat.error;phot.magfloatnullablee_Rmag[0.009/0.5]? Uncertainty in Rmagmagstat.error;phot.magfloatnullableImag[15.55/19.7]? I-band AB magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag[0.013/0.5]? Uncertainty in Imagmagstat.error;phot.magfloatnullablegmag[15.32/19.41]? g-band AB magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag[0.02/0.4]? Uncertainty in gmagmagstat.error;phot.magfloatnullablermag[15.28/19.51]? r-band AB magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag[0.05/0.2]? Uncertainty in rmagmagstat.error;phot.magfloatnullableimag[15.76/22.5]? i-band AB magnitudemagphot.mag;em.opt.Ifloatnullablee_imag[0.04/0.4]? Uncertainty in imagmagstat.error;phot.magfloatnullableClear[14.99/19.11]? Clear AB magnitude (2)magphot.mag;em.optfloatnullablee_Clear[0.013/0.4]? Uncertainty in Clearmagstat.errorfloatnullableTelTelescope (3)meta.id;instr.telcharJ/ApJ/909/176/table4Spectroscopic observations of SN 2017hparecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58052.5/58153.3] Modified Julian Datedtime.epochdoubleEpoch[-14.12/86.63] Epoch of observation relative to the epoch of B-band maximum (MJD=58066.6)yrtime.epochfloatlam1[3249/5896] Wavelength, start0.1nmem.wl;stat.minintlam2[8182/10400] Wavelength, end0.1nmem.wl;stat.maxintInstInstrument (Asiago, LCO, LJT, Lick 3m or XLT)meta.id;instrcharFileNameName of the ASCII file in subdirectory "sp"; column added by CDSmeta.id;meta.filecharSpInteractive spectrum plotmeta.ref.urlchar