PZ Telescopii
{{Short description|Star in the constellation Telescopium}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = Visual band light curves for PZ Telescopii, adapted from Innis et al. (1990)
}}
{{Starbox observe
| epoch = J2000
| constell = Telescopium
| dec = {{DEC|−50|10|49.8974}}
}}
{{Starbox character
| type =
| class = G9 IV + M7±1
| u-b =
| variable = BY Dra
}}
{{Starbox astrometry
| prop_mo_ra = {{val|+16.272|(18)}}
| prop_mo_dec = {{val|−85.519|(17)}}
| parallax = 21.1621
| p_error = 0.0223
}}
{{Starbox orbit
| period = {{val|120|110|30}}
| axis_unitless = {{val|27|14|4|ul=AU}}
| eccentricity = {{val|0.52|0.08|0.10}}
| inclination = {{val|91.73|0.36|0.32}}
| node = {{val|238.62|0.21|0.23}}
| periastron = {{val|1997.2|4.7|1.8}}
| periarg = {{val|50|50|30}}
}}
{{Starbox detail
| mass = {{val|1.13|0.03}}
| radius = {{Val|1.23|0.04}}
| luminosity = {{Val|0.993|0.004|0.005}}{{Cite Gaia DR2|6655168686921108864}}
| gravity = {{val|4.41|0.10}}
| temperature = {{val|5338|200|fmt=commas}}
| metal_fe = {{Val|+0.05|0.20}}
| rotation = {{val|0.943|0.002}}
| rotational_velocity = {{Val|69.0|0.1}}
| age_myr = {{val|24|3}}
| component2 = B
| temperature2 = {{Val|2700|100|fmt=commas}}
}}
{{Starbox catalog
| names = {{odlist | V=PZ Tel | CD=−50°12190 | HD=174429 | HIP=92680 | PPM=347231 | SAO=245781 | WDS=J18531-5011AB }}
}}
{{Starbox reference
| Simbad = V*+PZ+Tel
}}
{{End}}
PZ Telescopii, also known as HD 174429 or simply PZ Tel, is a young star in the constellation Telescopium. Based on parallax measurements, it is located at a distance of 154 light-years from the Sun. The star is drifting closer with a radial velocity of −4 km/s. It is too faint to be visible to the naked eye and is classified as a BY Draconis variable that ranges in apparent visual magnitude from 8.33 down to 8.63 over a period of {{convert|0.94088|days|hours|abbr=off|order=flip}}. It is one of the closest and hence brightest pre-main-sequence stars to Earth.
PZ Telescopii has an effective surface temperature of around 5,338 K (the Sun has an approximate surface temperature of 5,778 K), a mass around 1.13 times, and diameter 1.23 times that of the Sun. The star has a high rate of spin, showing a projected rotational velocity of 69 km/s and a rotation period of {{Convert|0.943|days|hours|disp=out}}. It is radiating about the same luminosity as the Sun. PZ Telescopii was originally considered to be a member of the Beta Pictoris moving group; however in a 2012 paper, James Jenkins of Universidad de Chile and colleagues used three methods to calculate its age and came up with a figure of around 24 million years—significantly older than the 12 million years of the association.
This star has an orbiting debris disk calculated to span from a radius of 35 to 165 astronomical units (AU), as well as a substellar companion with about 28 or 36 times the mass of Jupiter orbiting at a distance of about 16 AU, discovered in 2009 independently by two teams.{{Cite journal |last=Mugrauer |first=M. |last2=Vogt |first2=N. |last3=Neuhäuser |first3=R. |last4=Schmidt |first4=T. O. B. |date=November 2010 |title=Direct detection of a substellar companion to the young nearby star PZ Telescopii |url=http://www.aanda.org/10.1051/0004-6361/201015523 |journal=Astronomy & Astrophysics |volume=523 |pages=L1 |arxiv=1008.4506 |bibcode=2010A&A...523L...1M |doi=10.1051/0004-6361/201015523 |issn=0004-6361}} The companion, currently known as PZ Tel B, is thought to be a brown dwarf; however it is possible (though very unlikely) that it is an extremely large Jupiter-like planet,{{Cite journal |last=Schmidt |first=T. O. B. |last2=Mugrauer |first2=M. |last3=Neuhäuser |first3=R. |last4=Vogt |first4=N. |last5=Witte |first5=S. |last6=Hauschildt |first6=P. H. |last7=Helling |first7=Ch. |last8=Seifahrt |first8=A. |date=June 2014 |title=First spectroscopic observations of the substellar companion of the young debris disk star PZ Telescopii |url=http://www.aanda.org/10.1051/0004-6361/201321625 |journal=Astronomy & Astrophysics |volume=566 |pages=A85 |arxiv=1404.2870 |bibcode=2014A&A...566A..85S |doi=10.1051/0004-6361/201321625 |issn=0004-6361}} in which case it would be PZ Tel b, and the first such planet to be directly imaged. Preliminary orbital elements from 2016 give a best fit orbital period of 622.2 years with an eccentricity of 0.755.
The mass and orbit of this companion were updated in 2023 based on Hipparcos and Gaia astrometry, finding a somewhat lower mass, and an edge-on orbit that is eccentric but less so than previous results. It is now included in the NASA Exoplanet Archive since its nominal mass of {{Jupiter mass|27|link=y}} is below their upper limit of {{Jupiter mass|30}}, although the margin of error is large enough that it is still possible that the mass exceeds {{Jupiter mass|30}}.{{cite web |url=https://exoplanetarchive.ipac.caltech.edu/overview/PZ%20Tel |title=PZ Tel |publisher=NASA Exoplanet Archive |access-date=29 May 2023}}{{cite web |url=https://exoplanetarchive.ipac.caltech.edu/docs/exoplanet_criteria.html |title=Exoplanet Criteria for Inclusion in the Archive |publisher=NASA Exoplanet Archive |access-date=29 May 2023}}
References
{{Reflist|refs=
{{Cite Gaia DR3|6655168686921108864}}
{{cite simbad | title=V* PZ Tel | accessdate=1 July 2014 }}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters | arxiv=1108.4971
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | s2cid=119257644 }}
| last1=Torres | first1=C. A. O. | last2=Quast | first2=G. R.
| last3=Silva | first3=L. da | last4=Reza | first4=R. de la
| last5=Melo | first5=C. H. F. | last6=Sterzik | first6=M.
| title=Search for associations containing young stars (SACY) - I. Sample and searching method
| journal=Astronomy & Astrophysics|language=en
| volume=460 | issue=3 | pages=695–708 | date=December 1, 2006
| doi=10.1051/0004-6361:20065602 | issn=0004-6361
| bibcode=2006A&A...460..695T | arxiv=astro-ph/0609258 | s2cid=16080025 }}
| display-authors=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.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085 | s2cid=125853869 }}
| title=First light of the VLT planet finder SPHERE. II. The physical properties and the architecture of the young systems PZ Telescopii and HD 1160 revisited
| display-authors=1 | last1=Maire | first1=A. -L.
| last2=Bonnefoy | first2=M. | last3=Ginski | first3=C.
| last4=Vigan | first4=A. | last5=Messina | first5=S.
| last6=Mesa | first6=D. | last7=Galicher | first7=R.
| last8=Gratton | first8=R. | last9=Desidera | first9=S.
| last10=Kopytova | first10=T. G. | last11=Millward | first11=M.
| last12=Thalmann | first12=C. | last13=Claudi | first13=R. U.
| last14=Ehrenreich | first14=D. | last15=Zurlo | first15=A.
| last16=Chauvin | first16=G. | last17=Antichi | first17=J.
| last18=Baruffolo | first18=A. | last19=Bazzon | first19=A.
| last20=Beuzit | first20=J. -L. | last21=Blanchard | first21=P.
| last22=Boccaletti | first22=A. | last23=de Boer | first23=J.
| last24=Carle | first24=M. | last25=Cascone | first25=E.
| last26=Costille | first26=A. | last27=De Caprio | first27=V.
| last28=Delboulbé | first28=A. | last29=Dohlen | first29=K.
| last30=Dominik | first30=C. | last31=Feldt | first31=M.
| last32=Fusco | first32=T. | last33=Girard | first33=J. H.
| last34=Giro | first34=E. | last35=Gisler | first35=D.
| last36=Gluck | first36=L. | last37=Gry | first37=C.
| last38=Henning | first38=T. | last39=Hubin | first39=N.
| last40=Hugot | first40=E. | last41=Jaquet | first41=M.
| last42=Kasper | first42=M. | last43=Lagrange | first43=A. -M.
| last44=Langlois | first44=M. | last45=Le Mignant | first45=D.
| last46=Llored | first46=M. | last47=Madec | first47=F.
| last48=Martinez | first48=P. | last49=Mawet | first49=D.
| last50=Milli | first50=J. | last51=Möller-Nilsson | first51=O.
| last52=Mouillet | first52=D. | last53=Moulin | first53=T.
| last54=Moutou | first54=C. | last55=Origné | first55=A.
| last56=Pavlov | first56=A. | last57=Petit | first57=C.
| last58=Pragt | first58=J. | last59=Puget | first59=P.
| last60=Ramos | first60=J. | last61=Rochat | first61=S.
| last62=Roelfsema | first62=R. | last63=Salasnich | first63=B.
| last64=Sauvage | first64=J. -F. | last65=Schmid | first65=H. M.
| last66=Turatto | first66=M. | last67=Udry | first67=S.
| last68=Vakili | first68=F. | last69=Wahhaj | first69=Z.
| last70=Weber | first70=L. | last71=Wildi | first71=F.
| journal=Astronomy & Astrophysics
| volume=587 | id=A56 | pages=24 | date=March 2016
| doi=10.1051/0004-6361/201526594 | arxiv=1511.04072
| bibcode=2016A&A...587A..56M | s2cid=44360238 }}
| last1=Jenkins | first1=J. S. | last2=Pavlenko | first2=Y. V.
| last3=Ivanyuk | first3=O. | last4=Gallardo | first4=J.
| last5=Jones | first5=M. I. | last6=Day-Jones | first6=A. C.
| last7=Jones | first7=H. R. A. | last8=Ruiz | first8=M. T.
| last9=Pinfield | first9=D. J. | last10=Yakovina | first10=L.
| title=Benchmark Cool Companions: Ages and Abundances for the PZ Telescopii System
| display-authors=4 | journal=Monthly Notices of the Royal Astronomical Society
| volume=420 | issue=4 | pages=3587–98 | date=2012
| bibcode=2012MNRAS.420.3587J | arxiv=1111.7001
| doi=10.1111/j.1365-2966.2011.20280.x | doi-access=free | s2cid=18735984 }}
{{cite journal |last1=Biller |first1=Beth A. |last2=Liu |first2=Michael C. |display-authors=etal |date=September 2010 |title=The Gemini NICI Planet-finding Campaign: Discovery of a Close Substellar Companion to the Young Debris Disk Star PZ Tel |journal=The Astrophysical Journal Letters |volume=720 |issue=1 |pages=L82–L87 |doi=10.1088/2041-8205/720/1/L82 |arxiv=1007.4808 |bibcode=2010ApJ...720L..82B}}
{{cite journal |last1=Franson |first1=Kyle |last2=Bowler |first2=Brendan P. |date=June 2023 |title=Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B |journal=The Astronomical Journal |volume=165 |issue=6 |pages=246 |doi=10.3847/1538-3881/acca18 |arxiv=2304.01302 |bibcode=2023AJ....165..246F |doi-access=free }}
}}
External links
- {{cite web
| url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=36567
| title=PZ Telescopii | last=Watson | first=Christopher
| date=19 April 2012| work=AAVSO Website
| publisher=American Association of Variable Star Observers
| accessdate=1 July 2014 }}
{{Stars of Telescopium}}
{{DEFAULTSORT:PZ Telescopii}}