SN 2020akf
RA/DEC (2000)
09:28:39.663 +38:33:47.10
142.165263841 +38.5630839578
Type
SN Ia-91T-like
Redshift
0.012454
Related AstroNotes: 2020-17
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2020-01-20 12:04:19
TNS AT
Y
Public
Y
Discovery Mag
18.891
Filter
cyan-ATLAS
Reporter/s
J. Tonry, L. Denneau, A. Heinze, H. Weiland, H. Flewelling (IfA, University of Hawaii), B. Stalder (LSST), A. Rest (STScI), C. Stubbs (Harvard University), K. W. Smith, S. J. Smartt, D. R. Young, S. Srivastav, O. McBrien, D. O'Neill, P. Clark, M. Fulton, J. Gillanders, M. Dobson (Queen's University Belfast), T.-W. Chen (MPE), D. E. Wright (University of Minnesota), J. Anderson (ESO)
Separated 18,895.000 arcsec from TESS-active sector/s (20,21) source : RA=09:34:33.720, DEC=+33:27:06.12
Separated 29,039.800 arcsec from TESS-active sector/s (20,21) source : RA=09:57:09.024, DEC=+44:37:47.35
Separated 18,895.000 arcsec from TESS-Sector21 source : RA=09:34:33.720, DEC=+33:27:06.12
Separated 29,039.800 arcsec from TESS-Sector21 source : RA=09:57:09.024, DEC=+44:37:47.35

Spectra

 SN_2020akf - 2020-01-22 14:14:16 FTN / FLOYDS-N (Global SN Project)z=
Show H at z=vexp= km/s
Show He at z=vexp= km/s
Show He II at z=vexp= km/s
Show O at z=vexp= km/s
Show [O I] at z=vexp= km/s
Show O II at z=vexp= km/s
Show [O II] at z=vexp= km/s
Show [O III] at z=vexp= km/s
Show Na at z=vexp= km/s
Show Mg at z=vexp= km/s
Show Mg II at z=vexp= km/s
Show Si II at z=vexp= km/s
Show S II at z=vexp= km/s
Show Ca II at z=vexp= km/s
Show [Ca II] at z=vexp= km/s
Show Fe II at z=vexp= km/s
Show Fe III at z=vexp= km/s
Show Å at z=vexp= km/s
Show Å at z=vexp= km/s
Show Tellurics 
Show Galaxy lines at z=
Show WR-WN at z=vexp= km/s
Show WR-WC/O at z=vexp= km/s
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)
Spectra
SelectIDObs-date (UT)Tel / InstExp-TimeObserver/sReducer/sGroupSpectrum ascii fileSpectrum fits fileSpec. TypeAssoc. GroupsEnd prop. periodRemarks
59692020-01-22 14:14:16FTN / FLOYDS-N3600Las Cumbres ObservatoryDaichi HiramatsuGlobal SN Project tns_2020akf_2020-01-22_14-14-16_FTN_FLOYDS-N_Global_SN_Project.ascii tns_2020akf_2020-01-22_14-14-16_FTN_FLOYDS-N_Global_SN_Project.fitsObjectGlobal SN Project
Light Curves
FilterTel / InstObs-date rangePhotometry
z-SloanPS1_GPC12020-01-22 16:13:26 - 2020-01-22 16:13:261
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
1172872020-01-22 16:13:2617.760.0320.4ABMagz-SloanPS1_GPC1120Robot
w-PS1PS1_GPC12020-01-20 11:54:14 - 2020-01-20 11:54:141
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
1191532020-01-20 11:54:1418.880.0222ABMagw-PS1PS1_GPC145Robot
cyan-ATLASATLAS1_ACAM12020-01-20 12:04:19 - 2020-01-20 12:04:191
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
1150532020-01-20 12:04:1918.8910.13219.85ABMagcyan-ATLASATLAS1_ACAM130Robot
orange-ATLASATLAS1_ACAM12020-01-18 12:43:12 - 2020-01-18 12:43:121
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
1150522020-01-18 12:43:1219.64ABMagorange-ATLASATLAS1_ACAM130Robot[Last non detection]
AT Reports
IDTime received (UT)SenderReporter/sReportting groupDisc. Data SourceRADECDiscovery date (UT)Discovery Mag.FilterRelated filesAT TypeInternal nameAssoc. GroupsEnd prop. periodRemarks
613042020-02-08 00:39:15PS2_Bot1K. C. Chambers, T. de Boer, J. Bulger, J. Fairlamb, M. Huber, C.-C. Lin, T. Lowe, E. Magnier, A. Schultz, R. J. Wainscoat, M. Willman (IfA, University of Hawaii), K. W. Smith, D. R. Young, O. McBrien, J. Gillanders. S. Srivastav, S. J. Smartt, D. O'Neill, P. Clark, S. Sim (Queen's University Belfast), D. E. Wright (University of Minnesota)Pan-STARRS1Pan-STARRS109:28:39.663+38:33:47.102020-01-20 11:54:1418.88w-PS1PSNPS20krPan-STARRS1
604112020-01-28 23:28:23PS1_Bot1K. C. Chambers, T. de Boer, J. Bulger, J. Fairlamb, M. Huber, C.-C. Lin, T. Lowe, E. Magnier, A. Schultz, R. J. Wainscoat, M. Willman (IfA, University of Hawaii), K. W. Smith, D. R. Young, O. McBrien, J. Gillanders. S. Srivastav, S. J. Smartt, D. O'Neill, P. Clark, S. Sim (Queen's University Belfast), D. E. Wright (University of Minnesota)Pan-STARRS1Pan-STARRS109:28:39.669+38:33:47.152020-01-22 16:13:2617.76z-SloanPSNPS20krPan-STARRS1
594052020-01-21 12:40:14ATLAS_Bot1J. Tonry, L. Denneau, A. Heinze, H. Weiland, H. Flewelling (IfA, University of Hawaii), B. Stalder (LSST), A. Rest (STScI), C. Stubbs (Harvard University), K. W. Smith, S. J. Smartt, D. R. Young, S. Srivastav, O. McBrien, D. O'Neill, P. Clark, M. Fulton, J. Gillanders, M. Dobson (Queen's University Belfast), T.-W. Chen (MPE), D. E. Wright (University of Minnesota), J. Anderson (ESO)ATLASATLAS09:28:39.617+38:33:47.072020-01-20 12:04:1918.891cyan-ATLASPSNATLAS20bmmATLAS
Classification Reports
IDTime received (UT)SenderClassifier/sGroupClassificationRedshiftRelated filesAssoc. GroupsEnd prop. periodRemarks
59612020-01-23 18:33:34jburkeJamison Burke, Daichi Hiramatsu, D. Andrew Howell, Curtis McCully, Craig PellegrinoGlobal SN ProjectSN Ia-91T-like0.012454Global SN ProjectUsing Superfit (Howell et al. 2005, ApJ, 634, 1190) and SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find best fits to SNe Ia, including SN 1999aa and SN 1999ac at early times. The supernova is closest to KUG 0925+387B (z =0.012454 DM ~ 33.7; 2004SDSS3.C...0000, values from NED), and this host redshift is confirmed by host hydrogen and O III lines in the 2D spectrum. No fit by either SNID or Superfit matches all spectral features. We have included the Superfit comparison to SN 1999aa at -7 days, but SN 2020akf displays possible deep C II 6580 absorption at approximately 15,000 km/s, in addition to brighter fluxes bluewards of 4000 angstroms. The magnitude reported by ATLAS on discovery (AstroNote 2020-17) was 18.89 on 2020-01-20.50 (absolute magnitude -14.8), with a non-detection two days earlier. The absolute magnitude, blue continuum, and unusual spectral features lead us to tentatively classify this as a very young overluminous SN Ia. Further followup is encouraged.

Comments

Object coordinates updated according to AT-report 61304 of Group Pan-STARRS1
Previous RA, DEC: 09:28:39.669, +38:33:47.15 (142.165287123, +38.5630971945)
Updated RA, DEC: 09:28:39.663, +38:33:47.10 (142.165263841, 38.5630839578)

Object coordinates updated according to AT-report 60411 of Group Pan-STARRS1
Previous RA, DEC: 09:28:39.617, +38:33:47.07 (142.165071111, +38.5630755556)
Updated RA, DEC: 09:28:39.669, +38:33:47.15 (142.165287123, 38.5630971945)