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The New EXor Outbur...
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Hodapp, Klaus W.Univ Hawaii, Inst Astron, 640 N Aohoku Pl, Hilo, HI 96720 USA
(författare)
The New EXor Outburst of ESO-H alpha 99 Observed by Gaia ATLAS and TESS
- Artikel/kapitelEngelska2019
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2019-11-20
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IOP PUBLISHING LTD,2019
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LIBRIS-ID:oai:DiVA.org:uu-400053
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-400053URI
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https://doi.org/10.3847/1538-3881/ab471aDOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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We report photometry and spectroscopy of the outburst of the young stellar object ESO-H?99. The outburst was first noticed in Gaia alert Gaia18dvc and later by the Asteroid Terrestrial-impact Last Alert System (ATLAS). We have established the outburst light curve with archival ATLAS orange filter photometry, Gaia data, new V-band photometry, and J, H, and K-s photometry from the Infrared Imaging System (IRIS) and the United Kingdom Infrared Telescope (UKIRT). The brightness has fluctuated several times near the light curve maximum. The Transiting Exoplanet Survey Satellite (TESS) satellite observed ESO-H99 with high cadence during one of these minor minima and found brightness fluctuations on timescales of days and hours. Imaging with UKIRT shows the outline of an outflow cavity, and we find one knot of emission, now named MHO 1520, on the symmetry axis of this nebula, indicating recent collimated outflow activity from ESO-H99. Its pre-outburst SED shows a flat far-infrared spectrum, confirming its early evolutionary state and its similarity to other deeply embedded objects in the broader EXor class. The pre-outburst luminosity is 34 L, a much higher luminosity than typical EXors, indicating that ESO-H alpha 99 may be a star of intermediate mass. Infrared and optical spectroscopy show a rich emission-line spectrum, including H i lines, strong red Ca ii emission, as well as infrared CO bandhead emission, all characteristic EXors in the broadest sense. Comparison of the present spectra with an optical spectrum obtained in 1993, presumably in the quiescent state of the object, shows that during the present outburst the continuum component of the spectrum has increased notably more than the emission lines. The H alpha equivalent width during the outburst is down to one-half of its 1993 level, and shock-excited emission lines are much less prominent.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Reipurth, BoUniv Hawaii, Inst Astron, 640 N Aohoku Pl, Hilo, HI 96720 USA
(författare)
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Pettersson, Bertil,1945-Uppsala universitet,Observationell astrofysik(Swepub:uu)bertpett
(författare)
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Tonry, JohnUniv Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
(författare)
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Denneau, LarryUniv Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
(författare)
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Vallely, Patrick J.Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA
(författare)
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Shappee, Benjamin J.Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
(författare)
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Armstrong, James D.Univ Hawaii, Inst Astron, 34 Ohia Ku St, Pukalani, HI 96768 USA
(författare)
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Connelley, Michael S.Univ Hawaii, Inst Astron, 640 N Aohoku Pl, Hilo, HI 96720 USA
(författare)
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Kochanek, C. S.Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA
(författare)
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Fausnaugh, MichaelMIT Kavli Inst Space & Astrophys Res, 77 Massachusetts Ave,37-241, Cambridge, MA 02139 USA
(författare)
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Chini, RolfRuhr Univ Bochum, Astron Inst, Univ Str 150, D-44801 Bochum, Germany;Univ Catolica Norte, Inst Astron, Ave Angamos 0610, Antofagasta, Chile
(författare)
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Haas, MartinRuhr Univ Bochum, Astron Inst, Univ Str 150, D-44801 Bochum, Germany
(författare)
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Figaredo, Catalina SobrinoRuhr Univ Bochum, Astron Inst, Univ Str 150, D-44801 Bochum, Germany
(författare)
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Univ Hawaii, Inst Astron, 640 N Aohoku Pl, Hilo, HI 96720 USAObservationell astrofysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Astronomical Journal: IOP PUBLISHING LTD158:60004-62561538-3881
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Hodapp, Klaus W.
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Reipurth, Bo
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Pettersson, Bert ...
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Tonry, John
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Denneau, Larry
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Vallely, Patrick ...
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Shappee, Benjami ...
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Armstrong, James ...
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Connelley, Micha ...
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Kochanek, C. S.
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Fausnaugh, Micha ...
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Chini, Rolf
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Haas, Martin
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Figaredo, Catali ...
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