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HD 86226

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

{{Starbox begin}}

{{Starbox observe

| epoch = J2000.0

| constell = Hydra

| ra = {{RA|09|56|29.844}}

| dec = {{DEC|−24|05|57.80}}

| appmag_v = 7.93

}}

{{Starbox character

| type =

| class = G2V

| appmag_1_passband = B

| appmag_1 = 8.577

| appmag_2_passband = R

| appmag_2 = 7.71

| appmag_3_passband = J

| appmag_3 = {{val|6.839|0.019}}

| appmag_4_passband = H

| appmag_4 = {{val|6.577|0.034}}

| appmag_5_passband = K

| appmag_5 = {{val|6.463|0.023}}

| r-i =

| v-r = 0.22

| b-v = {{val|0.647|0.014}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|+19.56|0.19}}

| prop_mo_ra = −177.127

| prop_mo_dec = +47.099

| pm_footnote =

| parallax = 21.9301

| p_error = 0.0267

| parallax_footnote =

| absmag_v = 4.66

}}

{{Starbox detail

| source =

| mass = {{val|1.019|0.061|0.066}}

| radius = {{val|1.053|0.026|0.026}}

| gravity = {{val|4.400|0.029|0.032}}

| luminosity = {{val|1.180|0.036|0.029}}

| temperature = {{val|5863|88}}

| metal_fe = {{val|0.018|0.057|0.043}}

| age_gyr = {{val|4.6|3.7|2.7}}

| rotational_velocity = 3.6

}}

{{Starbox catalog

| names = {{odlist | CD=−23°8866 | HD=86226 | HIP=48739 | PPM=256971 | SAO=178205 }}

}}

{{Starbox reference

| Simbad = HD+86226

| NSTED = HD 86226

| EPE = HD+86226

}}

{{Starbox end}}

HD 86226 is a star with a pair of orbiting exoplanet companions, found in the constellation of Hydra. With an apparent visual magnitude of 7.93, it is too dim to be visible with the naked eye. The distance to this system has been determined by the parallax method, yielding a range of 149 light years. It is receding with a heliocentric radial velocity of +19.6 km/s. A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 12 astronomical units.

This is an ordinary G-type main-sequence star with a stellar classification of G2V. It is similar in size, mass, and composition to the Sun, although it is not considered a solar twin. The age is about the same; roughly 4.6 billion years old. The star is radiating 18% greater luminosity (compared to the Sun) from its photosphere at an effective temperature of 5,863 K. It is spinning with a projected rotational velocity of 3.6 km/s.

{{As of|2014}}, Radio emission at a frequency of 150 MHz has been tentatively detected from the proximity of this system, although it is not clear whether the star or a satellite orbiting a rapidly rotating planet is the source.

Planetary system

Due to the periodic spectrum shifts when it had when placed under a Doppler test, 13 Magellan Doppler Velocity observations were made of an object found near the star. The object discovered in 2010 had a Keplerian orbit, was declared an exoplanet and dubbed HD 86226 b. A hot Super-Earth planet called HD 86226 c was discovered in 2020. It may be undergoing considerable atmospheric mass loss.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = c

| mass_earth = 7.25{{±|1.19|1.12}}

| radius_earth = 2.16{{±|0.08}}

| period = 3.98442{{±|0.00018}}

| semimajor = 0.049{{±|0.001}}

| eccentricity = 0.075{{±|0.065|0.048}}

| inclination = 86.45{{±|0.26|0.16}}

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = 0.45{{±|0.04|0.05}}

| period = 1628{{±|22|21}}

| semimajor = 2.73{{±|0.06}}

| eccentricity = 0.059{{±|0.062|0.039}}

}}

{{Orbitbox end}}

See also

References

{{Reflist|2|refs=

{{cite simbad|title=HD 86226 |access-date=2010-02-10}}

{{Cite Gaia DR3|5660492297395345408}}

{{Cite Gaia DR2|5660492297395345408}}

{{cite journal

| title=XHIP: An extended hipparcos compilation

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

| 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=High-contrast imaging search for stellar and substellar companions of exoplanet host stars

| last1=Mugrauer | first1=M. | last2=Ginski | first2=C.

| journal=Monthly Notices of the Royal Astronomical Society

| date=12 May 2015 | volume=450 | issue=3 | pages=3127–3136

| doi=10.1093/mnras/stv771 | bibcode=2015MNRAS.450.3127M | doi-access=free

| url=https://academic.oup.com/mnras/article/450/3/3127/1063872

| access-date=19 June 2020 | hdl=1887/49340 | hdl-access=free }}

{{citation

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| last1=Houk | first1=Nancy | last2=Smith-Moore | first2=M.

| volume=4 | publication-place=Ann Arbor | year=1978

| publisher=Dept. of Astronomy, University of Michigan

| bibcode=1988mcts.book.....H }}

{{cite journal

| title=The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets

| last1=Marmier | first1=M. | last2=Ségransan | first2=D.

| last3=Udry | first3=S. | last4=Mayor | first4=M.

| last5=Pepe | first5=F. | last6=Queloz | first6=D.

| last7=Lovis | first7=C. | last8=Naef | first8=D.

| last9=Santos | first9=N. C. | last10=Alonso | first10=R.

| last11=Alves | first11=S. | last12=Berthet | first12=S.

| last13=Chazelas | first13=B. | last14=Demory | first14=B.-O.

| last15=Dumusque | first15=X. | last16=Eggenberger | first16=A.

| last17=Figueira | first17=P. | last18=Gillon | first18=M.

| last19=Hagelberg | first19=J. | last20=Lendl | first20=M.

| last21=A. Mardling | first21=R. | last22=Mégevand | first22=D.

| last23=Neveu | first23=M. | last24=Sahlmann | first24=J.

| last25=Sosnowska | first25=D. | last26=Tewes | first26=M.

| last27=Triaud | first27=A. H. M. J. | display-authors=1

| journal=Astronomy and Astrophysics

| volume=551 | date=March 2013 | pages=A90

| arxiv=1211.6444 | doi=10.1051/0004-6361/201219639

| bibcode=2013A&A...551A..90M | s2cid=59467665 }}

{{cite journal

| title=TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet

| last1=Teske | first1=Johanna | last2=Díaz | first2=Matías R.

| last3=Luque | first3=Rafael | last4=Močnik | first4=Teo

| last5=Seidel | first5=Julia V. | last6=Otegi | first6=Jon Fernández

| last7=Feng | first7=Fabo | last8=Jenkins | first8=James S.

| last9=Pallè | first9=Enric | last10=Ségransan | first10=Damien

| last11=Udry | first11=Stèphane | last12=Collins | first12=Karen A.

| last13=Eastman | first13=Jason D. | last14=Ricker | first14=George R.

| last15=Vanderspek | first15=Roland | last16=Latham | first16=David W.

| last17=Seager | first17=Sara | last18=Winn | first18=Joshua N.

| last19=Jenkins | first19=Jon M. | last20=Anderson | first20=David. R.

| last21=Barclay | first21=Thomas | last22=Bouchy | first22=François

| last23=Burt | first23=Jennifer A. | last24=Butler | first24=R. Paul

| last25=Caldwell | first25=Douglas A. | last26=Collins | first26=Kevin I.

| last27=Crane | first27=Jeffrey D. | last28=Dorn | first28=Caroline

| last29=Flowers | first29=Erin | last30=Haldemann | first30=Jonas

| display-authors=1 | journal=The Astronomical Journal

| volume=160 | issue=2 | page=96 | year=2020

| doi=10.3847/1538-3881/ab9f95 | arxiv=2007.13927

| bibcode=2020AJ....160...96T | s2cid=220830943 | doi-access=free }}

{{cite journal

| title=Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program

| last1=Arriagada | first1=Pamela | last2=Butler | first2=R. Paul

| last3=Minniti | first3=Dante | last4=López-Morales | first4=Mercedes

| last5=Shectman | first5=Stephen A. | last6=Adams | first6=Fred C.

| last7=Boss | first7=Alan P. | last8=Chambers | first8=John E.

| display-authors=1 | journal=The Astrophysical Journal

| year=2010 |volume=711 |issue=2 | pages=1229–1235

| doi=10.1088/0004-637X/711/2/1229 | arxiv=1001.4093

| bibcode=2010ApJ...711.1229A | s2cid=118682009 }}

{{cite journal

| title=Search for 150 MHz radio emission from extrasolar planets in the TIFR GMRT Sky Survey

| display-authors=1 | last1=Sirothia | first1=S. K.

| last2=Lecavelier des Etangs | first2=A. | last3=Gopal-Krishna

| last4=Kantharia | first4=N. G. | last5=Ishwar-Chandra | first5=C. H.

| journal=Astronomy & Astrophysics

| volume=562 | id=A108 | pages=9 | date=February 2014

| doi=10.1051/0004-6361/201321571 | bibcode=2014A&A...562A.108S | doi-access=free }}

{{cite journal

| title=Caught in the act: core-powered mass-loss predictions for observing atmospheric escape

| last1=Gupta | first1=Akash | last2=Schlichting | first2=Hilke E.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=504 | issue=3 | pages=4634–4648 | date=July 2021

| doi=10.1093/mnras/stab1128 | doi-access=free | arxiv=2103.08785

| bibcode=2021MNRAS.504.4634G }}

{{cite journal

| title=Spectroscopic study of solar twins and analogues

| display-authors=1 | last1=Datson | first1=Juliet

| last2=Flynn | first2=Chris | last3=Portinari | first3=Laura

| journal=Astronomy & Astrophysics

| volume=574 | id=A124 | pages=12 | date=February 2015

| doi=10.1051/0004-6361/201425000 | bibcode=2015A&A...574A.124D

| arxiv=1412.8168 | s2cid=53708062 }}

{{cite journal

| title=The evolution of lithium in FGK dwarf stars. The lithium-rotation connection and the Li desert

| last1=Llorente de Andrés |first1=F. |last2=Chavero |first2=C.

| last3=de la Reza |first3=R. |last4=Roca-Fàbrega |first4=S.

| last5=Cifuentes |first5=C. | display-authors=1

| journal=Astronomy and Astrophysics

| date=October 2021 | volume=654 | pages=A137

| doi=10.1051/0004-6361/202141339 | bibcode=2021A&A...654A.137L

| issn=0004-6361 | arxiv=2108.05852 | doi-access=free}}

}}

External links

  • {{cite web |title=HD 86226 |type=Database query |url=http://adsabs.harvard.edu/cgi-bin/nph-abs_connect?text=HD+86226 |website=SAO/NASA Astrophysics Data System (ADS)}}

{{Sky|09|56|29.84|-|24|05|57.8|139}}

{{Stars of Hydra}}

{{DEFAULTSORT:HD 86226}}

Category:G-type main-sequence stars

Category:Planetary systems with one confirmed planet

Category:Hydra (constellation)

CD-23 08866

086226

048739