CVSO 30

{{Starbox begin

| name = CVSO 30

}}

{{Starbox image

| image = 250px

| caption = VLT image of CVSO 30 and its planet, CVSO 30 c

}}

{{Starbox observe

| epoch = J2000.0

| constell = Orion

| ra = {{RA|05|25|07.556}}{{cite simbad

| title=CVSO 30

| accessdate=5 October 2018}}

| dec = {{DEC|+01|34|24.349}}

| appmag_v = +16.26

}}

{{Starbox character

| class = M3{{cite journal|doi=10.1088/0004-637X/755/1/42|title=The Ptf Orion Project: A Possible Planet Transiting a T-Tauri Star|journal=The Astrophysical Journal|volume=755|issue=1|pages=42|year=2012|last1=Van Eyken|first1=Julian C.|last2=Ciardi|first2=David R.|last3=von Braun|first3=Kaspar|last4=Kane|first4=Stephen R.|last5=Plavchan|first5=Peter|last6=Bender|first6=Chad F.|last7=Brown|first7=Timothy M.|last8=Crepp|first8=Justin R.|last9=Fulton|first9=Benjamin J.|last10=Howard|first10=Andrew W.|last11=Howell|first11=Steve B.|last12=Mahadevan|first12=Suvrath|last13=Marcy|first13=Geoffrey W.|last14=Shporer|first14=Avi|last15=Szkody|first15=Paula|last16=Akeson|first16=Rachel L.|last17=Beichman|first17=Charles A.|last18=Boden|first18=Andrew F.|last19=Gelino|first19=Dawn M.|last20=Hoard|first20=D. W.|last21=Ramírez|first21=Solange V.|last22=Rebull|first22=Luisa M.|last23=Stauffer|first23=John R.|last24=Bloom|first24=Joshua S.|last25=Cenko|first25=S. Bradley|last26=Kasliwal|first26=Mansi M.|last27=Kulkarni|first27=Shrinivas R.|last28=Law|first28=Nicholas M.|last29=Nugent|first29=Peter E.|last30=Ofek|first30=Eran O.|display-authors=1|arxiv = 1206.1510 |bibcode = 2012ApJ...755...42V |s2cid=2753064}}

| variable = T Tau

}}

{{Starbox astrometry

| prop_mo_ra = +1.73

| prop_mo_dec = +0.13

| parallax = 2.861

| p_error = 0.075

| dist_ly = 1140 ± 30 ly

| dist_pc = 349.5 ± 9.2

}}

{{Starbox detail

| age_myr = 2.65{{cite web

| title=Extrasolar Planets Encyclopaedia

| url=http://exoplanet.eu/catalog/cvso_30_b_/

| access-date=15 November 2016

| archive-date=19 February 2019

| archive-url=https://web.archive.org/web/20190219205932/http://exoplanet.eu/catalog/cvso_30_b_/

| url-status=dead

}}

| mass = 0.39 ± 0.05

| temperature = 3470

| radius = 1.39

}}

{{Starbox catalog

| names = 2MASS J05250755+0134243, PTFO 8-8695

}}

{{Starbox reference

| Simbad = CVSO+30

}}

CVSO 30 (PTFO 8-8695) is a suspected binary T Tauri star, located in constellation Orion at 1200 light years from Earth with one candidate planet called CVSO 30 c. The candidate planet is a gas giant. The star is named after the CIDA Variability Survey of Orion (CVSO){{Cite journal |last=Briceño |first=Cesar |last2=Calvet |first2=Nuria |last3=Hernández |first3=J. |last4=Vivas |first4=A. K. |last5=Hartmann |first5=Lee |last6=Downes |first6=J. J. |last7=Berlind |first7=Perry |date=February 2005 |title=The CIDA Variability Survey of Orion OB1. I. The Low-Mass Population of Ori OB1a and 1b |url=https://iopscience.iop.org/article/10.1086/426911 |journal=The Astronomical Journal |language=en |volume=129 |issue=2 |pages=907–926 |arxiv=astro-ph/0410521 |bibcode=2005AJ....129..907B |doi=10.1086/426911 |issn=0004-6256}} and the Palomar Transient Factory (PTF) and is within the 25 Ori group.{{Cite journal |last=Briceno |first=Cesar |last2=Hartmann |first2=Lee |last3=Hernandez |first3=Jesus |last4=Calvet |first4=Nuria |last5=Vivas |first5=A. Katherina |last6=Furesz |first6=Gabor |last7=Szentgyorgyi |first7=Andrew |date=June 2007 |title=25 Orionis: A Kinematically Distinct 10 Myr Old Group in Orion OB1a |url=https://iopscience.iop.org/article/10.1086/513087 |journal=The Astrophysical Journal |language=en |volume=661 |issue=2 |pages=1119–1128 |arxiv=astro-ph/0701710 |bibcode=2007ApJ...661.1119B |doi=10.1086/513087 |issn=0004-637X}}

Planetary system

{{Orbitbox planet begin

|name=CVSO 30

|table_ref={{Cite journal |last=Schmidt |first=T. O. B. |last2=Neuhäuser |first2=R. |last3=Briceño |first3=C. |last4=Vogt |first4=N. |last5=Raetz |first5=St. |last6=Seifahrt |first6=A. |last7=Ginski |first7=C. |last8=Mugrauer |first8=M. |last9=Buder |first9=S. |last10=Adam |first10=C. |last11=Hauschildt |first11=P. |last12=Witte |first12=S. |last13=Helling |first13=Ch. |last14=Schmitt |first14=J. H. M. M. |date=September 2016 |title=Direct Imaging discovery of a second planet candidate around the possibly transiting planet host CVSO 30 |url=http://www.aanda.org/10.1051/0004-6361/201526326 |journal=Astronomy & Astrophysics |volume=593 |pages=A75 |arxiv=1605.05315 |bibcode=2016A&A...593A..75S |doi=10.1051/0004-6361/201526326 |issn=0004-6361}}

|mass_ref=

|semimajor_ref=

|period_unit=year

|radius_ref=

|period_ref=

|eccentricity_ref=

|inclination_ref=

}}

{{OrbitboxPlanet hypothetical

|exoplanet=c

|mass=4.7 {{±|5.5|2.0}}

|semimajor=660

|period=27000

|radius=1.63 {{±|0.87|0.34}}

}}

CVSO 30 may have one planet called CVSO 30 c. CVSO 30 c is calculated to have a period of 27,000 years and a semimajor axis of 660 AU.

Direct imaging of the suspected CVSO 30 c, with a calculated mass equal to 4.7 Jupiter's, has been achieved through photometric and spectroscopic high contrast observations carried out with the Very Large Telescope located in Chile, the Keck Observatory in Hawaii and the Calar Alto Observatory in Spain.{{cite web|url=https://www.msn.com/en-gb/money/technology/amazing-photo-shows-likely-alien-planet-1200-light-years-away/ar-AAhocxR?ocid=spartandhp|title=Amazing Photo Shows Likely Alien Planet 1,200 Light-Years Away|publisher=MSN|date=21 June 2016|access-date=22 June 2016|archive-url=https://web.archive.org/web/20160811163050/http://www.msn.com/en-gb/money/technology/amazing-photo-shows-likely-alien-planet-1200-light-years-away/ar-AAhocxR?ocid=spartandhp|archive-date=11 August 2016|url-status=dead}} However, the colors of the object suggest that it may actually be a background star, such as a K-type giant or a M-type subdwarf.{{cite journal|bibcode=2018ApJ...852L..24L|doi=10.3847/2041-8213/aaa40b|title=Evidence that the Planetary Candidate CVSO30c is a Background Star from Optical, Seeing-limited Data|journal=The Astrophysical Journal|volume=852|issue=2|pages=L24|year=2018|last1=Lee|first1=Chien-Hsiu|last2=Chiang|first2=Po-Shih|arxiv=1712.08727|s2cid=119270170 |doi-access=free }}

File:CVSO30LightCurve.pngs for CVSO 30, adapted from Koen (2021){{cite journal |last1=Koen |first1=C. |title=Starspot modelling of the TESS light curve of CVSO 30 |journal=Astronomy and Astrophysics |date=March 2021 |volume=647 |page=L1 |doi=10.1051/0004-6361/202140400 |bibcode=2021A&A...647L...1K |url=https://www.aanda.org/articles/aa/full_html/2021/03/aa40400-21/aa40400-21.html |access-date=16 November 2022|doi-access=free |hdl=10566/6123 |hdl-access=free }}]]

By 2020, the phase of "dips" caused by suspected planet CVSO 30 b had drifted nearly 180 degrees from the expected value, thus ruling out the existence of the planet. Instead, a rare type of stellar starspot activity with very large starspots is now suspected. Also, CVSO 30 is suspected to be a stellar binary, with the previously reported planetary orbital period equal to the rotation period of the companion star.{{cite journal|arxiv=2005.10253|title=Properties of CVSO 30 from TESS measurements: Probably a binary T Tauri star with complex light curves and no obvious planets|year=2020|doi=10.1093/mnras/staa1038|last1=Koen|first1=C.|last2=Winn|first2=J. N.|last3=Ricker|first3=G. R.|last4=Vanderspek|first4=R.|last5=Latham|first5=D. W.|last6=Seager|first6=S.|last7=Jenkins|first7=J. M.|last8=Barclay|first8=T.|last9=Collins|first9=K. A.|last10=Doty|first10=J. P.|last11=Louie|first11=D. R.|last12=Quinn|first12=S. N.|last13=Rose|first13=M. E.|last14=Smith|first14=J. C.|last15=Villaseñor|first15=J.|last16=Wohler|first16=B.|display-authors=1|journal=Monthly Notices of the Royal Astronomical Society|volume=494|issue=3|pages=4349–4356|doi-access=free }} Further investigation of "dips" by 2022 led to hypothesis of a large gas cloud close to synchronous orbit, dust would likely sublimate.{{cite journal|arxiv=2201.12405|year=2022|title=YETI follow-up observations of the T Tauri star CVSO 30 with transit-like dips|doi=10.1093/mnras/stac293|last1=Bischoff|first1=R.|last2=Raetz|first2=St|last3=Fernández|first3=M.|last4=Mugrauer|first4=M.|last5=Neuhäuser|first5=R.|last6=Huang|first6=P. C.|last7=Chen|first7=W. P.|last8=Sota|first8=A.|last9=Ortega|first9=J Jiménez|last10=Hambaryan|first10=V. V.|last11=Zieliński|first11=P.|last12=Dróżdż|first12=M.|last13=Stenglein|first13=W Ogłoza W.|last14=Hohmann|first14=E.|last15=Michel|first15=K-U|last16=Michel|first16=K. -U.|display-authors=1|journal=Monthly Notices of the Royal Astronomical Society|doi-access=free }}

CVSO 30

Planetary system

References

Further reading