“WISE 0647-6232”的意思、由来-开放百科全书

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WISE 0647-6232

释义

History of observations
Discovery
Distance
Properties
See also
References

{{Sky|06|47|23.2270|-|62|32|39.744|28.4}}{{Starbox begin
|name=WISE J064723.23-623235.5}}{{Starbox observe
|epoch=J2000{{r|Kirkpatrick2013}}
|equinox=J2000{{r|Kirkpatrick2013}}
|ra={{RA|06|47|23.2270}}{{r|Kirkpatrick2013}}
|dec={{DEC|-62|32|39.744}}{{r|Kirkpatrick2013}}
|constell=Pictor}}{{Starbox character
|class=Y1 ± 0.5{{r|Kirkpatrick2013}}
|appmag_1_passband=J (LCO filter system)
|appmag_1=>23.0 ± 0.1{{r|Kirkpatrick2013}}
|appmag_2_passband=J (MKO filter system)
|appmag_2=22.65 ± 0.27{{r|Kirkpatrick2013}}
|appmag_3_passband=H (LCO filter system)
|appmag_3=>21.7 ± 0.3{{r|Kirkpatrick2013}}
|appmag_4_passband=H (MKO filter system)
|appmag_4=23.40 ± 0.29{{r|Kirkpatrick2013}}
|appmag_5_passband=W1
|appmag_5=>19.09{{r|Kirkpatrick2013}}
|appmag_6_passband=W2
|appmag_6=15.32 ± 0.08{{r|Kirkpatrick2013}}
|appmag_7_passband=W3
|appmag_7=>13.49{{r|Kirkpatrick2013}}
|appmag_8_passband=W4
|appmag_8=>9.66{{r|Kirkpatrick2013}}
}}{{Starbox astrometry
|radial_v=
|prop_mo_ra=7 ± 12{{r|Kirkpatrick2013}}
|prop_mo_dec=387 ± 22{{r|Kirkpatrick2013}}
|parallax=115
|p_error=12
|parallax_footnote={{r|Kirkpatrick2013}}
|absmag_v=}}{{Starbox detail
|mass_mj=5–30{{r|Kirkpatrick2013}}
|temperature=350–400{{r|Kirkpatrick2013}}
|gravity=3.0–5.0{{r|Kirkpatrick2013}}
}}{{Starbox catalog
|names=WISE J064723.23-623235.5{{r|Kirkpatrick2013}}
WISE 0647-6232{{r|Kirkpatrick2013}}
}}{{Starbox reference
|Simbad=WISE+J064723.23-623235.5
}}{{Starbox end}}

WISE 0647-6232 (full designation is WISE J064723.23-623235.5) is a nearby brown dwarf of spectral type Y1 ± 0.5, located in constellation Pictor at approximately 28 light-years from Earth. It is one of the two or three reddest and one of the four latest-type brown dwarfs known.{{r|Kirkpatrick2013}}

History of observations

Discovery

WISE 0647-6232 was discovered by Kirkpatrick et al. from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite — NASA infrared-wavelength 40-cm (16-in) space telescope, which mission lasted from December 2009 to February 2011. The discovery was announced in 2013.

WISE 0647-6232 was first imaged by WISE on 9 May 2010. On 17 June 2010 after preliminary data processing it was uncovered as a very cold brown dwarf candidate.

Then were carried out follow-up observations:

using the Infrared Array Camera (IRAC) on Spitzer Space Telescope, starting from MJD 55458.43 (possibly 16 September 2010);
J- and H-band images using Persson's Auxiliary Nasmyth Infrared Camera (PANIC) at the 6.5-meter Magellan Baade telescope at the Las Campanas Observatory, Chile, on 25 November 2010;
with the FourStar infrared camera also at Magellan Baade telescope on 15 January 2013 and 23 March 2013;
with the Folded-port InfraRed Echellette (FIRE) spectrograph also at Magellan Baade telescope on 24 March 2013;
using the Wide Field Camera 3 (WFC3) on Hubble Space Telescope on 13–14 May 2013, and pre-image was obtained on 11 February 2013.

On 25 August 2013 Kirkpatrick et al. submitted the discovery paper to The Astrophysical Journal.

WISE 0647-6232 became the 17th Y-type dwarf discovered and confirmed spectroscopically (in addition, WD 0806-661B is also almost certainly a Y-type dwarf, which was found before discovery of WISE 0647-6232, but it still lacks a spectroscopical confirmation).{{r|Kirkpatrick2013}}

Distance

Preliminary parallax of WISE 0647-6232, measured using WISE, HST and Spitzer and published in its discovery paper is 115 ± 12 mas, corresponding to a distance 8.7{{±|1.0|0.8}} pc, or 28.4{{±|3.3|2.7}}ly.{{r|Kirkpatrick2013}}

WISE 0647-6232 distance estimates
Source	Parallax, mas	Distance, pc	Distance, ly	Ref.
Kirkpatrick et al. (2013)	115 ± 12	8.7{{±>1.0\|0.8}}	28.4{{±>3.3\|2.7}}	Kirkpatrick2013}}

The best estimate is marked in bold.

Properties

WISE 0647-6232 has effective temperature 350–400 K and mass ∼{{Jupiter mass|Jup=y|link=y|5–30}}, but its kinematics suggests that it may belong to Columba moving group (probability of this is 92.9%, and corresponding radial velocity should be ∼22 km/s), if it is so, it may be very young (~30 Myr) and have even lower mass (<{{Jupiter mass|Jup=y|link=y|2}}). Its blue J − H color may suggest that its surface gravity may be relatively low (log(g)=3.0–3.5, where g is in units of cm·s⁻²). For ages from 0.1 to more than 10 Gyr log(g)=4.0–5.0.{{r|Kirkpatrick2013}}

The only redder than WISE 0647-6232 confirmed Y dwarf is WISE 1828+2650. WD 0806-661B may also be redder than WISE 0647-6232.

The other three latest-type Y dwarfs are: WISE 0350-5658 (Y1), WISE 0535-7500 (≥Y1){{r|Marsh2012}} and WISE 1828+2650 (≥Y2).{{r|Kirkpatrick2013}}

References

1. ^{{cite journal |last=Kirkpatrick |first=J. Davy |authorlink=J. Davy Kirkpatrick |author2=Cushing, Michael C. |author3=Gelino, Christopher R. |author4=Beichman, Charles A. |author5=Tinney, C. G. |author6=Faherty, Jacqueline K. |author7=Schneider, Adam |author8=Mace, Gregory N. |title=Discovery of the Y1 Dwarf WISE J064723.23-623235.5 |date=2013 |arxiv=1308.5372v1 |doi=10.1088/0004-637X/776/2/128 |volume=776 |journal=The Astrophysical Journal |page=128 |bibcode=2013ApJ...776..128K}}

^[1]
}}{{Stars of Pictor}}

5 : Pictor (constellation)|Brown dwarfs|Y-type stars|WISE objects|Astronomical objects discovered in 2010

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History of observations

Discovery

Distance

Properties

See also

References