Tau Ceti f

Tau Ceti fDiscovery

Discovery date| December 19, 2012

Detection method

| Doppler spectroscopy
Orbital characteristics

Semi-major axis

| 1.334 au
Eccentricity| 0.16
Orbital period| 1.7 y
Star| Tau Ceti
Physical characteristics
Mean radius| ~1.81 R⊕ (estimate)[1]
Mass| ≥3.93 M🜨

surface gravity

| ≥1.201 g
≥11.78 m/s2

Tau Ceti f is a candidate super-Earth[2] or mini-Neptune orbiting Tau Ceti that was discovered in 2012 by statistical analyses of the star's variations in radial velocity, based on data obtained using HIRES, AAPS, and HARPS. It is of interest because its orbit places it in Tau Ceti's extended habitable zone,[3][4] but a 2015 study implies that there may not be a detectable biosignature because it has only been in the temperate zone for less than one billion years.[5][6] In 2017, it was again recovered from radial-velocity data, along with Tau Ceti e. Despite this, it remains unconfirmed and disputed.[7]

## Contents

* 1 Characteristics
* 2 Habitability
* 3 See also
* 4 References

## Characteristics

Few properties of the planet are known other than its orbit and mass. It orbits Tau Ceti at a distance of 1.35 AU (roughly Mars's perihelion in the Solar System) with an orbital period of 642 days, and has a minimum mass of 3.93 Earth masses.[7] However, if it and its companion planets were similarly inclined to Tau Ceti's debris disk at 35±10°, f could 5.56+1.48
−1.94 and 9.30+2.48
−3.24 Earth masses, which means it's slightly more likely to be a mini-Neptune, although the exoplanet is included in the conservative sample of potentially habitable exoplanets.[8] It is estimated to be 1.81 Earth radii.[1]

A 2021 study was unable to confirm this planet, finding instead that its signal is most likely an instrumental artifact combined with a previously unknown 1000-day signal.[9]

## Habitability

As of October 2020, Tau Ceti f is considered the most potentially habitable exoplanet orbiting a Sun-like star.[10] Its neighbor, Tau Ceti e, was previously regarded as a potentially habitable exoplanet in the conservative sample, but it was determined to likely be too hot to hold life, more similar to Venus.[11] It and its companion may suffer from a continuous bombardment of asteroids, up to 10 times higher than in the Solar System,[12] but a conjectured (super-)Jovian planet as outlined in a 2019 Astronomy & Astrophysics paper may be shepherding the disk, as it may be as close as 3 AU and as far away as 20.[13]

Tau Ceti f has a somewhat eccentric orbit, varying from approximately 1.12 to 1.547 AU. Therefore, Tau Ceti f receives ~20.3% ± 0.41% Earth flux at apocenter and ~38.86% ± 0.796% Earth flux at pericenter, for an average of ~27.42% ± 0.562% Earth flux. Tau Ceti f has an estimated equilibrium temperature of only 190 Kelvin. If the conditions were the same as on the Earth, Tau Ceti f's average temperature would be around -50 °C. However, with a thicker atmosphere and a larger ocean, the temperature could resemble Earth's.[14]

## See also

* Sub-Neptune

## References

1. ↑ 1.0 1.1 "Exoplanet-catalog". https://exoplanets.nasa.gov/exoplanet-catalog/7180/tau-ceti-f/.
2. ↑ "Exoplanet-catalog". https://exoplanets.nasa.gov/exoplanet-catalog/7180/tau-ceti-f/.
3. ↑ "Two Nearby Habitable Worlds? - Planetary Habitability Laboratory @ UPR Arecibo". http://phl.upr.edu/press-releases/twonearbyhabitableworlds.
4. ↑ "Four Exoplanets Detected around Nearby Star Tau Ceti | Astronomy | Sci-News.com" (in en-US). http://www.sci-news.com/astronomy/tau-ceti-exoplanets-05117.html.
5. ↑ April 2015, Mike Wall 24 (24 April 2015). "Nearby Alien Planets Not So Life-Friendly After All" (in en). https://www.space.com/29191-exoplanets-tau-ceti-alien-life.html.
6. ↑ Pagano, Michael; Truitt, Amanda; Young, Patrick A.; Shim, Sang-Heon (2015-04-21). "THE CHEMICAL COMPOSITION OF τ CETI AND POSSIBLE EFFECTS ON TERRESTRIAL PLANETS". The Astrophysical Journal 803 (2): 90. doi:10.1088/0004-637X/803/2/90. ISSN 1538-4357. https://iopscience.iop.org/article/10.1088/0004-637X/803/2/90.
7. ↑ 7.0 7.1 Feng, Fabo; Tuomi, Mikko; Jones, Hugh R. A.; Barnes, John; Anglada-Escude, Guillem; Vogt, Steven S.; Butler, R. Paul (2017-09-05). "Color difference makes a difference: four planet candidates around tau Ceti". The Astronomical Journal 154 (4): 135. doi:10.3847/1538-3881/aa83b4. ISSN 1538-3881. Bibcode: 2017AJ....154..135F.
8. ↑ "The Habitable Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo". http://phl.upr.edu/projects/habitable-exoplanets-catalog/.
9. ↑ Cretignier, Michael et al. (September 2021). "YARARA: Significant improvement in RV precision through post-processing of spectral time series". Astronomy & Astrophysics 653: A43. doi:10.1051/0004-6361/202140986. Bibcode: 2021A&A...653A..43C.
10. ↑ "The Habitable Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo". https://phl.upr.edu/hwc.
11. ↑ "Two Nearby Habitable Worlds? - Planetary Habitability Laboratory @ UPR Arecibo". https://sites.google.com/a/upr.edu/planetary-habitability-laboratory-upra/press-releases/twonearbyhabitableworlds.
12. ↑ "Death Down Asteroid Alley" (in en-US). 2004-07-02. https://www.astrobio.net/meteoritescomets-and-asteroids/death-down-asteroid-alley/.
13. ↑ Kervella, Pierre; Arenou, Frédéric et al. (2019). "Stellar and substellar companions of nearby stars from Gaia DR2". Astronomy & Astrophysics 623: A72. doi:10.1051/0004-6361/201834371. ISSN 0004-6361. Bibcode: 2019A&A...623A..72K. ""We also detect the signature of a possible planet of a few Jovian masses orbiting τ Ceti…The observed signal could be explained for example, by a Jupiter analog orbiting at 5au."".
14. ↑ "Open Exoplanet Catalogue - tau Ceti f". http://openexoplanetcatalogue.com/planet/tau Ceti f/.

Template:Tau Ceti

* v
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Cetus constellation

Stars
(list)|

| Bayer|

* α (Menkar)
* β (Diphda)
* γ (Kaffaljidhma)
* δ
* ε
* ζ (Baten Kaitos)
* η
* θ
* ι
* κ1
* κ2
* λ
* μ
* ν
* ξ1
* ξ2
* ο (Mira)
* π
* ρ
* σ
* τ
* υ
* φ1
* φ2
* φ3
* φ4
* χ

|

Flamsteed|

* 1
* 2
* 3
* 6
* 7
* 9
* 10
* 11
* 12
* 13
* 14
* 15
* 18
* 20
* 21
* 25
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* 79
* 80
* 81
* 84
* 93
* 94
* 95
* 25 Ari

Variable|

* T
* RR
* TV
* TW
* UU
* VZ (Mira B)
* WW
* WX
* XY
* XZ
* YZ
* ZZ
* AA
* AB
* AD
* AR
* BG
* BK
* CF
* DK
* EH
* EL
* EO
* ES

HR|

* 9
* 10
* 12
* 16
* 31
* 37
* 51
* 61
* 66
* 72
* 108
* 115
* 118
* 150
* 159
* 172
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* 560
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* 625
* 638
* 651
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* 745
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* 783
* 784
* 795
* 796
* 816
* 870
* 908
* 926
* 942
* 9054
* 9095
* 9096
* 9101

HD|

* 1690
* 1879
* 2268
* 2638
* 4747
* 5319
* 6037
* 6718
* 7449
* 8713
* 8896
* 9690
* 9731
* 10024
* 10725
* 11365
* 11396
* 11506
* 11964
* 12116
* 12702
* 13004
* 13546
* 13763
* 15115
* 16008
* 16031
* 17001
* 224349
* 224693 (Axólotl)

Gliese|

* Gliese 40
* Gliese 105
* GJ 1002
* GJ 1005
* GJ 1057
* GJ 2012

Other|

* BD−17 63
* Cayrel's Star
* CFBDS J005910.90–011401.3
* CS 31082-001
* DENIS-P J020529.0−115925
* GD 40
* HIP 5158
* HIP 11952
* L 870-2
* LHS 1140
* Luyten 726-8 (UV/BL)
* NGC 156
* NGC 302
* NGC 308
* NGC 310
* PSR B0031−07
* PSR J0034−0534
* PSR J0108−1431
* SDSS J001820.5−093939.2
* SDSS J0106−1000
* ULAS J003402.77−005206.7
* WD J2356-209
* WASP-26
* WASP-44
* WASP-71
* WISE J0254+0223

Nebulae|

| Planetary|

* BoBn 1
* NGC 246

|

Galaxies|

| Messier|

* 77

|

NGC|

* 17
* 35
* 45
* 47
* 50
* 54
* 59
* 61
* 62
* 64
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* 73
* 77
* 102
* 107
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* 333B
* 335
* 336
* 337
* 337A
* 340
* 341
* 341B
* 342
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* 478
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* 519
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* 541
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* 547
* 548
* 550
* 554A
* 554B
* 555
* 556
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* 560
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* 1048A
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* 1128
* 1137
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* 1194
* 1211
* 1218
* 1219
* 1254
* 1280
* 7807
* 7808
* 7813
* 7821
* 7828
* 7829

Other|

* Arp 147
* Arp 256
* 3C 15
* 3C 17
* 3C 75
* Cetus Dwarf Spheroidal galaxy
* HCM-6A
* Holmberg 15A
* IC 1613
* IRAS F01475-0740
* Markarian 573
* Markarian 1014
* Markarian 1018
* Markarian 1044
* NAB 0205+024
* PHL 938
* PKS 0048-097
* PKS 0106+013
* PKS 0119-046
* PKS 0139-097
* PKS 0215+015
* PKS 0237-233
* PKS 0306+102
* QSO B0137+012
* QSO B0302-003
* SDSS J0303-0019
* SMM J02399-0136
* SXDF-NB1006-2
* 9Spitch
* Ton S180
* UM 673
* VV 114
* Wolf–Lundmark–Melotte

Galaxy
clusters|

* Abell 85
* Abell 119
* Abell 133
* Abell 151
* Abell 168
* Abell 194
* Abell 209
* Abell 222
* Abell 223
* Abell 267
* Abell 370
* Abell 400
* HCG 16
* IRC 0218
* JKCS 041
* RX J0152.7-1357

Other|

* GRB 000911
* GRB 041006
* GRB 050908
* GRB 060908
* GRB 091127
* SN 1984L
* SN 2005gj
* SN 2005hk

* v
* t
* e

2012 in space

* « 2011

2013 »

Space probe
launches|

* Van Allen Probes

Comets|

* C/2011 Q2 (McNaught)
* C/2012 C2 (Bruenjes)
* C/2006 S3 (LONEOS)
* C/2013 L2 (Catalina)
* C/2010 R1 (LINEAR)
* C/2011 U3 (PANSTARRS)
* C/2011 UF305 (LINEAR)
* C/2011 R1 (McNaught)
* C/2013 F1 (Boattini)
* C/2013 G2 (McNaught)
* C/2012 J1 (Catalina)

NEOs|

* Asteroid close approaches
* 2012 EG5
* 2012 TV
* 2012 TC4
* 2012 KP24
* 2012 BX34
* 2012 FP35
* 2012 KT42

Exoplanets|

* Gliese 667 Cc
* Alpha Centauri Bb
* Gliese 163 c
* HD 40307 e
* HD 40307 f
* HD 40307 g
* Kappa Andromedae b
* KELT-2Ab
* Kepler-23b
* Kepler-32b
* Kepler-32c
* Kepler-34b
* Kepler-36b
* Kepler-42c
* Kepler-47b
* Kepler-47c
* Kepler-56
* Kepler-80
* Kepler-88
* Kepler-89
* PH1b
* Tau Ceti e
* Tau Ceti f

Space
exploration|

* ANUSAT
* Curiosity
* Dragon C2+
* Edoardo Amaldi ATV
* Ekspress AM4
* Explorer 8
* Fobos-Grunt
* Kedr
* Kosmos 2176
* Kosmos 2261
* Kounotori 3
* Navid
* PharmaSat
* Progress M-13M
* Progress M-14M
* Progress M-15M
* Sfera
* Shenzhou 9
* Solar Anomalous and Magnetospheric Particle Explorer
* Soyuz TMA-03M
* Soyuz TMA-04M
* Soyuz TMA-05M
* Soyuz TMA-22
* SpaceX CRS-1
* TacSat-3
* USA-226
* Yinghuo-1

* Category:2011 in space — Category:2012 in space — Category:2013 in space

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