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Gliese 687#Planetary system

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

{{Sky|17|36|25.8999|+|68|20|20.909|14.839}}

{{Starbox begin

| name=Gliese 687

}}

{{Starbox image

| image = 300px

| caption = Gliese 687 is the small orange star located in the center of the above image.

}}

{{Starbox observe

| epoch=J2000

| constell=Draco

| ra={{RA|17|36|25.89931}}

| dec={{DEC|+68|20|20.9096}}

| appmag_v=9.15

}}

{{Starbox character

| class=M3.5 V

| b-v=1.49

| u-b=1.06

| variable=

}}

{{Starbox astrometry

| radial_v={{val|-28.90|0.13}}

| prop_mo_ra=–320.675

| prop_mo_dec=–1269.893

| pm_footnote=

| parallax=219.7898

| p_error=0.0210

| parallax_footnote=

| absmag_v=10.87

}}

{{Starbox detail

| mass={{val|0.40|0.02}}

| radius={{val|0.4183|0.0070}}

| luminosity={{val|0.02128|0.00023}}

| gravity=4.66

| temperature={{val|3413|28|fmt=commas}}

| metal_fe=+0.11 ± 0.20

| rotation={{val|61.8|1.0|ul=d}}

| rotational_velocity=<2.8

| age=

}}

{{Starbox catalog

| names={{odlist | BD=+68 946 | GJ=687 | HIP=86162 | LHS=450 | LTT=15232 | PLX=4029.00 | SAO=17568 |Argelander Oeltzen 17415}}

}}

{{Starbox reference

| Simbad = GJ+687

| NSTED = GJ-687

}}

{{Starbox image

|image={{Location map|100x100|AlternativeMap=Draco_constellation_map.svg

|alt=Gliese 687 is located in the constellation Draco.

|caption=Location of Gliese 687 in the constellation Draco|border=infobox|mark=Red_pog.png|width=300

|label=Gliese 687

|lat=44.3

|long=36.6

}}|caption=

}}

{{Starbox end}}

Gliese 687, or GJ 687 (Gliese–Jahreiß 687) is a red dwarf in the constellation Draco. This is one of the closest stars to the Sun and lies at a distance of {{convert|14.84|ly|pc|lk=on|abbr=off}}. Even though it is close by, it has an apparent magnitude of about 9, so it can only be seen through a moderately sized telescope. Gliese 687 has a high proper motion, advancing 1.304 arcseconds per year across the sky. It has a net relative velocity of about 39 km/s. It is known to have a Neptune-mass planet. Old books and articles refer to it as Argelander Oeltzen 17415.

Properties

Gliese 687 has about 40% of the Sun's mass and nearly 50% of the Sun's radius. Compared to the Sun, it has a slightly higher proportion of elements with higher atomic numbers than helium. It seems to rotate every 60 days and exhibit some chromospheric activity.

It displays no excess of infrared radiation that would indicate orbiting dust.{{cite journal

| last=Gautier |first=((Thomas N., III)) |display-authors=etal

| title=Far-Infrared Properties of M Dwarfs

| journal=The Astrophysical Journal | volume=667 | issue=1

| pages=527–536 |date=September 2007

| doi=10.1086/520667 | bibcode=2007ApJ...667..527G |arxiv = 0707.0464 |s2cid=15732144

}}

Gliese 687 is a solitary red dwarf that emits X-rays.{{ cite journal |doi=10.1086/176149 |author1=Schmitt JHMM |author2=Fleming TA |author3=Giampapa MS |title=The X-ray view of the low-mass stars in the solar neighborhood |journal=Astrophys. J. |date=September 1995 |volume=450 |issue=9 |pages=392–400 |bibcode=1995ApJ...450..392S |doi-access=free }}

Planetary system

In 2014, Gliese 687 was discovered to have a planet, Gliese 687 b, with a minimum mass of 18.394 Earth masses (which makes it comparable to Neptune), an orbital period of 38.14 days, a low orbital eccentricity and inside the habitable zone. Another Neptune-mass planet candidate was discovered in 2020, in a further out and much colder orbit.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass_earth = {{val|17.2|1.0|p=≥}}

| period = {{val|38.142|0.007}}

| semimajor = {{val|0.163|0.003}}

| eccentricity = {{val|0.17|0.05}}

}}

{{OrbitboxPlanet

| exoplanet = c

| mass_earth = {{val|16.0|4.1|p=≥}}

| period = {{val|727.562|12.198}}

| semimajor = {{val|1.165|0.023}}

| eccentricity = {{val|0.40|0.22}}

}}

{{Orbitbox end}}

See also

References

{{reflist|refs=

{{Cite Gaia DR3|1637645127018395776}}

{{cite journal |author1=Endl, Michael |author2=Cochran, William D. |author3=Kürster, Martin |author4=Paulson, Diane B. |author5=Wittenmyer, Robert A. |author6=MacQueen, Phillip J. |author7=Tull, Robert G. | title=Exploring the Frequency of Close-in Jovian Planets around M Dwarfs | journal=The Astrophysical Journal | volume=649 | issue=1 | pages=436–443 |date=September 2006 | doi=10.1086/506465 | bibcode=2006ApJ...649..436E | arxiv=astro-ph/0606121 |s2cid=14461746 }}

{{cite journal | author=Berger, D. H. |display-authors=etal | title=First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars | journal=The Astrophysical Journal | year=2006 | volume=644 | issue=1 | pages=475–483 | doi=10.1086/503318 | bibcode=2006ApJ...644..475B|arxiv = astro-ph/0602105 |s2cid=14966363 }}

{{cite journal |author1=Jenkins, J. S. |author2=Ramsey, L. W. |author3=Jones, H. R. A. |author4=Pavlenko, Y. |author5=Gallardo, J. |author6=Barnes, J. R. |author7=Pinfield, D. J. | title=Rotational Velocities for M Dwarfs | journal=The Astrophysical Journal | volume=704 | issue=2 | pages=975–988 |date=October 2009 | doi=10.1088/0004-637X/704/2/975 | bibcode=2009ApJ...704..975J |arxiv = 0908.4092 |s2cid=119203469 }}

{{cite web | title=LHS 450 -- High proper-motion Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LHS+450 | access-date=2009-11-12 | archive-date=2017-11-09 | archive-url=https://web.archive.org/web/20171109080847/http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LHS+450 | url-status=live }}

{{cite journal | author1=Lynn, W. T. | title=On the proper motions of three stars | journal=Monthly Notices of the Royal Astronomical Society | volume=50 | pages=519–520 | date=June 1890 | issue=8 | doi=10.1093/mnras/50.8.519| bibcode=1890MNRAS..50..519L | doi-access=free }}

{{cite journal|last1=Boyajian|first1=Tabetha S.|last2=von Braun|first2=Kaspar|last3=van Belle|first3=Gerard|last4=McAlister|first4=Harold A.|last5=ten Brummelaar|first5=Theo A.|last6=Kane|first6=Stephen R.|last7=Muirhead|first7=Philip S.|last8=Jones|first8=Jeremy|last9=White|first9=Russel|last10=Schaefer|first10=Gail|last11=Ciardi|first11=David|last12=Henry|first12=Todd|last13=López-Morales|first13=Mercedes|last14=Ridgway|first14=Stephen|last15=Gies|first15=Douglas|last16=Jao|first16=Wei-Chun|last17=Rojas-Ayala|first17=Bárbara|last18=Parks|first18=J. Robert|last19=Sturmann|first19=Laszlo|last20=Sturmann|first20=Judit|last21=Turner|first21=Nils H.|last22=Farrington|first22=Chris|last23=Goldfinger|first23=P. J.|last24=Berger|first24=David H.|title=Stellar Diameters and Temperatures. Ii. Main-Sequence K- and M-Stars|display-authors=1|journal=The Astrophysical Journal|volume=757|issue=2|year=2012|pages=112|issn=0004-637X|doi=10.1088/0004-637X/757/2/112|arxiv=1208.2431|bibcode=2012ApJ...757..112B|doi-access=free}}

{{cite journal |arxiv=1405.2929 |title=The Lick–Carnegie exoplanet survey: Gliese 687 b: A Neptune-mass planet orbiting a nearby red dwarf|year=2014|doi=10.1088/0004-637X/789/2/114|last1=Burt|first1=Jennifer|last2=Vogt|first2=Steven S.|last3=Butler|first3=R. Paul|last4=Hanson|first4=Russell|last5=Meschiari|first5=Stefano|last6=Rivera|first6=Eugenio J.|last7=Henry|first7=Gregory W.|last8=Laughlin|first8=Gregory|journal=The Astrophysical Journal|volume=789|issue=2|page=114|bibcode=2014ApJ...789..114B|s2cid=17668957}}

{{cite journal|arxiv=2008.07998|title=Search for Nearby Earth Analogs. III. Detection of ten new planets, three planet candidates, and confirmation of three planets around eleven nearby M dwarfs|year=2020|doi=10.3847/1538-4365/abb139|doi-access=free|last1=Feng|first1=Fabo|last2=Shectman|first2=Stephen A.|last3=Clement|first3=Matthew S.|last4=Vogt|first4=Steven S.|last5=Tuomi|first5=Mikko|last6=Teske|first6=Johanna K.|last7=Burt|first7=Jennifer|last8=Crane|first8=Jeffrey D.|last9=Holden|first9=Bradford|author10=Sharon Xuesong Wang|last11=Thompson|first11=Ian B.|last12=Diaz|first12=Matias R.|last13=Paul Butler|first13=R.|s2cid=221150644 |journal=The Astrophysical Journal Supplement Series |volume=250 |issue=2 |pages=29 |bibcode=2020ApJS..250...29F}}

}}

External links

  • [http://www.hs.uni-hamburg.de/~st1h314/starpage.cgi?identifier=1010 NEXXUS page] {{Webarchive|url=https://web.archive.org/web/20120222061657/http://www.hs.uni-hamburg.de/~st1h314/starpage.cgi?identifier=1010 |date=2012-02-22 }}

{{nearest systems|2}}

{{Stars of Draco}}

{{DEFAULTSORT:Gliese 687}}

Category:Draco (constellation)

Category:Local Bubble

Category:M-type main-sequence stars

086162

0687

Category:Planetary systems with two confirmed planets

BD+68 0946