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AB Pictoris

{{Short description|Star in the constellation Pictor}}

{{Starbox begin

| name = AB Pictoris

}}

{{Starbox image

| image = Image:The Star AB Pictoris and its Companion - Phot-14d-05-normal.jpg

| caption = Coronagraphic image of AB Pictoris showing its tiny companion (bottom left). The data was obtained on 16 March 2003 with NACO on the VLT, using a 1.4 arcsec occulting mask on top of AB Pictoris.

}}

{{Starbox observe

| epoch = J2000.0

| constell = Pictor

| ra = {{RA|06|19|12.913}}

| dec = {{DEC|−58|03|15.53}}

| appmag_v=9.13 ({{val|9.21|to|9.35}})

}}

{{Starbox character

| class = K1V(e)

| b-v = 0.861{{±|0.027}}

| variable = BY Dra

}}

{{Starbox astrometry

| radial_v = 22.6{{±|0.3}}

| prop_mo_ra = {{val|14.314|0.015}}

| prop_mo_dec = {{val|45.234|0.017}}

| pm_footnote =

| parallax = 19.9452

| p_error = 0.0124

| parallax_footnote =

| absmag_v= 5.82

}}

{{Starbox detail

| rotational_velocity = 10.87{{±|0.08}}

| rotation = {{val|3.90|0.08|u=days}}

| radius = 0.92{{±|0.03}}

| mass = 0.90{{±|0.10}}

| temperature = 5,188{{±|50}}

| age_myr = 13

| gravity = 4.67{{±|0.09}}

| luminosity = 0.51

| metal_fe = −0.54

}}

{{Starbox catalog

| names = {{odlist | V=AB Pic | CD=−58 1409 | CPD=−58 670 | HD=44627A, 44627 | HIP=30034 | PPM=335089 | SAO=234448 }}

}}

{{Starbox reference

| Simbad = AB+Pic

}}

{{Starbox end}}

AB Pictoris (abbreviated AB Pic, also catalogued as HD 44627) is a K-type main-sequence star, located 163.5 light-years away in the southern constellation of Pictor. It has been identified as a member of the young (30 million years old) Tucana–Horologium association.{{cite journal | title=New Members of the TW Hydrae Association, β Pictoris Moving Group, and Tucana/Horologium Association | last1=Inseok Song | first1=B. Zuckerman | first2=M. S. | last2=Bessell | journal=The Astrophysical Journal | volume=599 | issue=1 | date=December 2003 | pages=342–350 | bibcode=2003ApJ...599..342S | doi=10.1086/379194 | s2cid=51833191 | doi-access=free }}. The star has been classified as a BY Draconis variable, indicating it has an active chromosphere. It is an X-ray source and displays emission lines in its spectrum.

In 2005 it was announced that an astronomical object (AB Pictoris b, abbreviated AB Pic b) had been imaged in 2003 and 2004 close to and apparently in orbit around the star. Its mass suggests that it is at the borderline between being a brown dwarf or a planet.

File:ABPicLightCurve.png light curve for AB Pictoris. The main plot shows the long-term variability, and the inset plot shows the periodic variation. Adapted from Kiraga (2012)]]

{{Anchor|AB Pic b}}Planetary system

In 2003 and 2004, an object (now catalogued as AB Pictoris b) was observed close to the star by a team of astronomers at the European Southern Observatory. Since it had common proper motion with AB Pictoris, it was concluded that it was physically close to the star. Its spectral type was estimated as between L0V and L3V. Using evolutionary models, its mass was estimated as from 13 to 14 Jupiter masses.A companion to AB Pic at the planet/brown dwarf boundary, G. Chauvin, A.-M. Lagrange, B. Zuckerman, C. Dumas, D. Mouillet, I. Song, J.-L. Beuzit, P. Lowrance, and M. S. Bessell, Astronomy and Astrophysics 438, #3 (August 2005), pp. L29–L32, {{bibcode|2005A&A...438L..29C}}, {{doi|10.1051/0004-6361:200500111}}, {{arxiv|astro-ph/0504658}}. However, because modelling such young objects is difficult, this estimate is very uncertain; some models give masses as low as 11 Jupiter masses or as high as 70 Jupiter masses. Temperature estimates range from 1600 K to 2400 K.Homogeneous comparison of directly detected planet candidates: GQ Lup, 2M1207, AB Pic, Ralph Neuhaeuser, ESO Workshop Proceedings on Multiple Stars, {{bibcode|2005astro.ph..9906N}}, {{arxiv|astro-ph/0509906}}. As it is not known if the mass of the object exceeds the deuterium burning limit of 13 Jupiter masses, it is not clear whether the object should be classified as an extrasolar planet or a brown dwarf. In 2010 a team obtained the spectrum of AB Pic b with VLT/SINFONI. This confirmed this object as an L-dwarf with low surface gravity, matching a spectral type of L0-L1. It also constrained the temperature to {{Val|2000|100|300}} Kelvin. Another team found that AB Pic b has a lower temperature of 1400-1700 K and possibly a lower mass (7-14 {{Jupiter mass}}, from figure 13). A later analysis did find a temperature of {{Val|1800|100|200}} K and a mass of 10-14 {{Jupiter mass}}. The planet shows several molecular and atomic absorption lines in the spectrum. The most notable are water vapor, carbon monoxide, potassium and sodium. The planetary orbit is significantly misaligned with its spin axis orientation (obliquity), possibly due to gravitational interactions with the additional inner planet.

An additional planet, AB Pictoris c, was revealed by combining direct imaging, radial velocity and the astrometric acceleration from AB Pic A. This result was later corroborated with a re-analysis of the Gaia excess noise and the proper motion anomaly.

{{OrbitboxPlanet begin

| name =

| table_ref = {{cite encyclopedia |url=https://exoplanet.eu/catalog/ab_pic_b--280/ |title=Notes for Planet AB Pic b |author=Jean Schneider |year=2011 |encyclopedia=Extrasolar Planets Encyclopaedia |access-date=12 October 2011}}{{citation|arxiv=2211.01474|year=2023|title=Peering into the young planetary system AB Pic|doi=10.1051/0004-6361/202244294 | display-authors=1 |last1=Palma-Bifani |first1=P. |last2=Chauvin |first2=G. |last3=Bonnefoy |first3=M. |last4=Rojo |first4=P. M. |last5=Petrus |first5=S. |last6=Rodet |first6=L. |last7=Langlois |first7=M. |last8=Allard |first8=F. |last9=Charnay |first9=B. |last10=Desgrange |first10=C. |last11=Homeier |first11=D. |last12=Lagrange |first12=A.-M. |last13=Beuzit |first13=J.-L. |last14=Baudoz |first14=P. |last15=Boccaletti |first15=A. |last16=Chomez |first16=A. |last17=Delorme |first17=P. |last18=Desidera |first18=S. |last19=Feldt |first19=M. |last20=Ginski |first20=C. |last21=Gratton |first21=R. |last22=Maire |first22=A.-L. |last23=Meyer |first23=M. |last24=Samland |first24=M. |last25=Snellen |first25=I. |last26=Vigan |first26=A. |last27=Zhang |first27=Y. |journal=Astronomy & Astrophysics |volume=670 |pages=A90 |s2cid=253265148 }}

| period_unit = day

}}

{{OrbitboxPlanet

| exoplanet = c

| mass = {{val|2.5|-|9}}

| radius =

| semimajor = {{val|3|-|5}}

| period =

| eccentricity =

| inclination =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = 10{{±|1}}

| radius = 1.8{{±|0.2}}

| semimajor = 190{{±|200|50}}

| period =

| eccentricity =

| inclination = 90{{±|12}}

}}

{{Orbitbox end}}

{{clear|left}}

See also

References

{{Reflist|refs=

{{Cite journal |last1=Bonnefoy |first1=M. |last2=Chauvin |first2=G. |last3=Lagrange |first3=A. -M. |last4=Rojo |first4=P. |last5=Allard |first5=F. |last6=Pinte |first6=C. |last7=Dumas |first7=C. |last8=Homeier |first8=D. |date=2014-02-01 |title=A library of near-infrared integral field spectra of young M-L dwarfs |url=https://ui.adsabs.harvard.edu/abs/2014A&A...562A.127B/abstract |journal=Astronomy and Astrophysics |volume=562 |pages=A127 |arxiv=1306.3709 |bibcode=2014A&A...562A.127B |doi=10.1051/0004-6361/201118270 |issn=0004-6361}}

{{Cite journal |last=Booth |first=M.|title=The Age of the Carina Young Association and Potential Membership of HD 95086|date=2025-01-17 |arxiv=2501.10488|url=https://ui.adsabs.harvard.edu/abs/2021MNRAS.500.5552B/abstract|journal=Monthly Notices of the Royal Astronomical Society }}

{{Cite arXiv |last=Lagrange |first=A.-M. |last2=Kiefer |first2=F. |last3=Rubini |first3=P. |last4=Squicciarini |first4=V. |last5=Chomez |first5=A. |last6=Milli |first6=J. |last7=Zurlo |first7=A. |last8=Bouvier |first8=J. |last9=Delorme |first9=P. |title=Searching for substellar companion candidates with Gaia. III. Search for companions to members of young associations |date=2025-01-17 |arxiv=2501.10488 }}

{{Cite journal |last1=Patience |first1=J. |last2=King |first2=R. R. |last3=De Rosa |first3=R. J. |last4=Vigan |first4=A. |last5=Witte |first5=S. |last6=Rice |first6=E. |last7=Helling |first7=Ch. |last8=Hauschildt |first8=P. |date=2012-04-01 |title=Spectroscopy across the brown dwarf/planetary mass boundary. I. Near-infrared JHK spectra |url=https://ui.adsabs.harvard.edu/abs/2012A&A...540A..85P/abstract |journal=Astronomy and Astrophysics |volume=540 |pages=A85 |arxiv=1201.3921 |bibcode=2012A&A...540A..85P |doi=10.1051/0004-6361/201118058 |issn=0004-6361}}

{{Cite journal |last1=Bonnefoy |first1=M. |last2=Chauvin |first2=G. |last3=Rojo |first3=P. |last4=Allard |first4=F. |last5=Lagrange |first5=A. -M. |last6=Homeier |first6=D. |last7=Dumas |first7=C. |last8=Beuzit |first8=J. -L. |date=2010-03-01 |title=Near-infrared integral-field spectra of the planet/brown dwarf companion AB Pictoris b |url=https://ui.adsabs.harvard.edu/abs/2010A&A...512A..52B/abstract |journal=Astronomy and Astrophysics |volume=512 |pages=A52 |arxiv=1001.0470 |bibcode=2010A&A...512A..52B |doi=10.1051/0004-6361/200912688 |issn=0004-6361}}

{{cite journal

| title=ASAS Photometry of ROSAT Sources. I. Periodic Variable Stars Coincident with Bright Sources from the ROSAT All Sky Survey

| last=Kiraga | first=M.

| journal=Acta Astronomica

| date=March 2012 | volume=62 | issue=1 | pages=67–95

| arxiv=1204.3825 | bibcode=2012AcA....62...67K

| url=https://ui.adsabs.harvard.edu/abs/2012AcA....62...67K

| access-date=20 February 2022 }}

{{Cite Gaia DR3|5495052596695570816}}

{{cite simbad | title=V* AB Pic | access-date=October 3, 2008 }}

{{cite journal

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 }}

{{cite journal

| title=General catalogue of variable stars | version=GCVS 5.1

| last1=Samus' | first1=N. N | last2=Kazarovets | first2=E. V

| last3=Durlevich | first3=O. V | last4=Kireeva | first4=N. N

| last5=Pastukhova | first5=E. N | journal=Astronomy Reports

| display-authors=1 | volume=61 | issue=1 | pages=80 | year=2017

| bibcode=2017ARep...61...80S | s2cid=125853869

| doi=10.1134/S1063772917010085 }}

{{cite journal

| title=Search for associations containing young stars (SACY)

| last1=Torres | first1=C. A. O. | last2=Quast | first2=G. R.

| last3=da Silva | first3=L. | last4=de la Reza | first4=R.

| last5=Melo | first5=C. H. F. | last6=Sterzik | first6=M.

| display-authors=1 | journal=Astronomy & Astrophysics

| date=September 12, 2006 | volume=460 | issue=3 | pages=695–708

| issn=0004-6361 | eissn=1432-0746

| doi=10.1051/0004-6361:20065602 | bibcode=2006A&A...460..695T

| doi-access=free | arxiv=astro-ph/0609258 }}

{{cite journal

| title=Rotation Periods, Inclinations, and Obliquities of Cool Stars Hosting Directly Imaged Substellar Companions: Spin-Orbit Misalignments Are Common

| last1=Bowler | first1=Brendan P. | last2=Tran | first2=Quang H.

| last3=Zhang | first3=Zhoujian | last4=Morgan | first4=Marvin

| last5=Ashok | first5=Katelyn B. | last6=Blunt | first6=Sarah

| last7=Bryan | first7=Marta L. | last8=Evans | first8=Analis E.

| last9=Franson | first9=Kyle | last10=Huber | first10=Daniel

| last11=Nagpal | first11=Vighnesh | last12=Wu | first12=Ya-Lin

| last13=Zhou | first13=Yifan | display-authors=1

| journal=The Astronomical Journal

| volume=165 | issue=4 | id=164 | date=April 2023

| page=164 | doi=10.3847/1538-3881/acbd34 | arxiv=2301.04692

| bibcode=2023AJ....165..164B | doi-access=free }}

{{cite journal

| last1=Haakonsen | first1=Christian Bernt | last2=Rutledge | first2=Robert E.

| title=XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources

| journal=The Astrophysical Journal Supplement

| volume=184 | issue=1 | pages=138–151 | date=September 2009

| bibcode=2009ApJS..184..138H | arxiv=0910.3229

| doi=10.1088/0067-0049/184/1/138 | s2cid=119267456 }}

{{cite journal

| title=Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars

| first1=Gerard T. | last1=van Belle | first2=Kaspar | last2=von Braun

| journal=The Astrophysical Journal

| volume=694 | issue=2 | pages=1085–1098 | date=2009

| arxiv=0901.1206 | bibcode=2009ApJ...694.1085V

| doi=10.1088/0004-637X/694/2/1085 | s2cid=18370219 }}

{{cite journal

| title=Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity

| last1=Ghezzi | first1=L. | last2=Cunha | first2=K.

| last3=Smith | first3=V. V. | last4=de Araújo | first4=F. X.

| last5=Schuler | first5=S. C. | last6=de la Reza | first6=R.

| journal=The Astrophysical Journal

| date=August 19, 2010 | volume=720 | issue=2 | pages=1290–1302

| issn=0004-637X | eissn=1538-4357

| doi=10.1088/0004-637X/720/2/1290 | bibcode=2010ApJ...720.1290G

| arxiv=1007.2681 | doi-access=free}}

}}

External links

  • {{cite encyclopedia |url=http://exoplanet.eu/star.php?st=AB+Pic |archive-url=https://web.archive.org/web/20060621072810/http://exoplanet.eu/star.php?st=AB+Pic |url-status=dead |archive-date=June 21, 2006 |title=Notes for star AB Pic |author=Jean Schneider |year=2011 |encyclopedia=Extrasolar Planets Encyclopaedia |access-date=12 October 2011}}
  • Homogeneous comparison of directly detected planet candidates: GQ Lup, 2M1207, AB Pic, Ralph Neuhaeuser, ESO Workshop Proceedings on Multiple Stars, {{bibcode|2005astro.ph..9906N}}, {{arxiv|astro-ph/0509906}}.
  • {{cite web|url=http://www.eso.org/public/outreach/press-rel/pr-2005/pr-12-05-p2.html |title=Yes, it is the Image of an Exoplanet |access-date=2008-07-01 |work=European Southern Observatory |date=2005-04-30 |archive-url=https://web.archive.org/web/20080613192044/http://www.eso.org/public/outreach/press-rel/pr-2005/pr-12-05-p2.html |archive-date=2008-06-13 |url-status=dead }}

{{Clear}}

{{Stars of Pictor}}

{{DEFAULTSORT:AB Pictoris}}

Category:K-type main-sequence stars

Category:BY Draconis variables

Category:Astronomical X-ray sources

Category:Planetary systems with one confirmed planet

Category:Pictor

CD-58 01409

030034

044627

Pictoris, AB