Discovery of Precursor LBV Outbursts in Two Recent Optical Transients: The Fitfully Variable Missing Links UGC 2773-OT and SN 2009ip

Abstract

We present progenitor-star detections, light curves, and optical spectra of SN2009ip and the 2009 optical transient in UGC2773 (U2773-OT), which were not genuine SNe. Precursor variability in the decade before outburst indicates that both of the progenitor stars were LBVs. Their pre-outburst light curves resemble the S Doradus phases that preceded giant eruptions of eta Carinae and SN1954J (V12 in NGC2403), with intermediate progenitor luminosities. HST detections a decade before discovery indicate that the SN2009ip and U2773-OT progenitors were supergiants with likely initial masses of 50-80 Msun and $\ga$20 Msun, respectively. Both outbursts had spectra befitting known LBVs, although in different physical states. SN 2009ip exhibited a hot LBV spectrum with characteristic speeds of 550 km/s, plus faster material up to 5000 km/s, resembling the slow Homunculus and fast blast wave of eta Carinae. U2773-OT shows a forest of narrow absorption and emission lines comparable to that of S Dor in its cool state, plus [CaII] emission and an IR excess indicative of dust, similar to SN2008S and N300-OT. [CaII] emission is probably tied to a dusty pre-outburst environment, and not the outburst mechanism. SN2009ip and U2773-OT may provide a critical link between historical LBV eruptions, while U2773-OT may provide a link between LBVs and SN2008S and N300-OT. Future searches will uncover more examples of precursor LBV variability of this kind, providing key clues that may help unravel the instability driving LBVs.

18 pages, 13 Figures, accepted AJ. added significant material while revising after referee report

References in corpus (40)

• WFPC2 Stellar Photometry with HSTphot
• Database of Geneva stellar evolution tracks and isochrones for UBVRIJHKLL'M, HST-WFPC2, Geneva and Washington photometric systems
• On the role of continuum-driven eruptions in the evolution of very massive stars and Population III stars
• The Charge Transfer Efficiency and Calibration of WFPC2
• The Structure of the Homunculus: I. Shape and Latitude Dependence from H2 and [Fe II] Velocity Maps of Eta Carinae
• A Porosity-Length Formalism for Photon-Tiring-Limited Mass Loss from Stars Above the Eddington Limit
• The type IIn supernova 1994W: evidence for the explosive ejection of a circumstellar envelope
• Discovery of the Dust-Enshrouded Progenitor of SN 2008S with Spitzer
• A New Class of Luminous Transients and A First Census of Their Massive Stellar Progenitors
• SN 1997bs in M66: Another Extragalactic Eta Carinae Analog?
• The Missing Luminous Blue Variables and the Bistability Jump
• SN 2008S: an electron capture SN from a super-AGB progenitor?
• Spectral Evolution of the Extraordinary Type IIn Supernova 2006gy
• An unusually brilliant transient in the galaxy Messier 85
• The 2008 Luminous Optical Transient in the Nearby Galaxy NGC 300
• An Intermediate Luminosity Transient in NGC300: The Eruption of a Dust-Enshrouded Massive Star
• SN 2008S: A Cool Super-Eddington Wind in a Supernova Impostor
• The Early Light Curve of the Optical Afterglow of GRB 021211
• Discovery of a nearby twin of SN1987A's nebula around the luminous blue variable HD168625: Was Sk--69 202 an LBV?
• Galactic Twins of the Ring Nebula Around SN1987A and a Possible LBV-like Phase for Sk-69 202
• A Blast Wave from the 1843 Eruption of Eta Carinae
• On the Progenitors of Two Type II-P Supernovae in the Virgo Cluster
• Crossing the `Yellow Void' -- Spatially Resolved Spectroscopy of the Post- Red Supergiant IRC+10420 and Its Circumstellar Ejecta
• A very faint core-collapse supernova in M85
• Physical parameters of erupting Luminous Blue Variables: NGC 2363-V1 caught in the act
• A Spitzer/IRS Spectrum of the 2008 Luminous Transient in NGC 300: Connection to Proto-Planetary Nebulae
• NGC 300 OT2008-1 As a Scaled-Down Version of the Eta Carinae Great Eruption
• The NGC 300 Transient: An Alternative Method For Measuring Progenitor Masses
• The Photometric and Spectral Evolution of the 2008 Luminous Optical Transient in NGC 300
• The sub-arcsecond dusty environment of Eta Carinae
• A Three-Decade Outburst of the LMC Luminous Blue Variable R127 Draws to a Close
• Episodic Post-Shock Dust Formation in the Colliding Winds of Eta Carinae
• Supernova 1954J (Variable 12) in NGC 2403 Unmasked
• Optical Spectra and Light Curves of Supernovae
• Possible Recovery of SN 1961V In Hubble Space Telescope Archival Images
• Spatially extended K I 7699 emission in the nebula of VY CMa: Kinematics and geometry
• The Nature of SN 1961V
• A new Luminous Variable in M33
• An Upper Mass Limit on a Red Supergiant Progenitor for the Type II-Plateau Supernova SN 2006my
• SN2010U -- a Luminous Nova in NGC 4214

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