SDSS J1416+1348

From Wikipedia, the free encyclopedia
Jump to: navigation, search

Coordinates: Sky map 14h 16m 24.08s, +13° 48′ 26.7″

SDSS J141624.08+134826.7
Observation data
Epoch 2003.41[1]      Equinox J2000[1]
Constellation Boötes
Right ascension 14h 16m 24.08s[1]
Declination 13° 48′ 26.7″[1]
Characteristics
Spectral type sdL7[2] / T7.5p[3]
Apparent magnitude (r) 20.69 ± 0.04[1] / -
Apparent magnitude (i) 18.38 ± 0.01[1] / -
Apparent magnitude (z) 15.92 ± 0.01[1] / -
Apparent magnitude (Y) 14.255 ± 0.003[1] / 18.16 ± 0.02[3]
Apparent magnitude (J) 12.995 ± 0.001[4] / 17.259 ± 0.017[4]
Apparent magnitude (H) 12.469 ± 0.001[4] / 17.62 ± 0.02[3]
Apparent magnitude (KS) 12.053 ± 0.001[4] / 18.93 ± 0.17[3]
R−I color index 2.31 ± 0.04[3] / -
J−H color index 0.55 ± 0.01[3] / -0.3[4]
J−K color index 1.03 ± 0.03[2] / -1.7[4]
Astrometry
Radial velocity (Rv) -42.2 ± 5.1[5] km/s
Proper motion (μ) RA: 88.0 ± 2.8[5] mas/yr
Dec.: 139.9 ± 1.3[5] mas/yr
Parallax (π) 109.9 ± 1.8[6] mas
Distance 29.7 ± 0.5 ly
(9.1 ± 0.1 pc)
Orbit[6]
Primary A
Companion B
Semi-major axis (a) 104+28
−72
a.u.
Details
Component A
Mass ~0.072[3] M
Mass ~75[3] MJup
Surface gravity (log g) 5.5[7] cgs
Temperature 1700[7] K
Age ~10[3] Gyr
Component B
Mass 0.021–0.045[8] M
Mass 22–47[8] MJup
Surface gravity (log g) 5.2 ± 0.4[8] cgs
Temperature 650 ± 60[8] K
Metallicity ≤-0.3 ([M/H])[8]
Age 2–10[8] Gyr
Position (relative to A)
Component B
Angular distance 9.81 [6]
Observed separation
(projected)
89.3 ± 1.5 AU [6]
Other designations
Component A:
SDSS J141624.08+134826.7,[1][5] SDSS J1416+1348,[1] SDSS J1416+13A,[7] SDSS J1416+13,[3] SDSS 1416+13,[5] SDSS 141624,[9] 2MASS J14162408+1348263,[10] SOZ 3A,[10] WDS J14164+1348A[10]

Component B:
ULAS J141623.94+134836.30,[3] ULAS J141623.94+134836.3,[4] SDSS J141624.08+134826.7B,[11] ULAS J1416+1348,[8] SDSS J1416+1348B,[12] ULAS J1416+13,[3] SDSS J1416+13B,[7] SDSS 141624 b,[9] WISE J141623.94+134836.0,[13] SOZ 3B,[11] WDS J14164+1348B[11]
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data

SDSS J1416+1348 (full designation is SDSS J141624.08+134826.7) is a nearby wide binary system of two brown dwarfs, located in constellation Boötes. The system consists of L-type component A and T-type component B.

Discovery[edit]

Component A was discovered in late 2009[note 1] from a search of Sloan Digital Sky Survey (SDSS) Data Release 7, an astronomical survey conducted at Apache Point Observatory in New Mexico, United States. It has two discovery papers: Bowler et al., 2009[1] and Schmidt et al., 2009.[5]

Component B was discovered in early 2010 from UKIDSS Large Area Survey (ULAS) Data Release 5[3] & 6,[4] an astronomical survey conducted on the United Kingdom Infrared Telescope (UKIRT) on Mauna Kea in Hawaii. It has also two discovery papers: Burningham et al., 2010[3] and Scholz, 2010.[4] Burningham et al. discovered the whole system (independently of Bowler et al. and Schmidt et al.[3]) by cross-matching the ULAS DR5 against SDSS DR7,[3] and Scholz discovered component B by inspecting the UKIDSS finding charts around already found component A.[4]

Distance[edit]

In 2012 was published the first relatively precise parallax of SDSS J1416+1348, measured at the Canada-France-Hawaii Telescope under The Hawaii Infrared Parallax Program: 109.9 ± 1.8 mas, corresponding to a distance 9.10 ± 0.15 pc (29.7 ± 0.5 ly).[6] (Although, two parallaxes with large errors was previously published by Bowler et al.[1] and Scholz[4]).

SDSS J1416+1348 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Bowler et al., 2009 107 ± 34[note 2] 9.3+4.4
−2.3
30.5+14.2
−7.6
[1]
Bowler et al., 2009 8.4 ± 1.9 27.4 ± 6.2 [1]
Schmidt et al., 2009 8.0 ± 1.6 26.1 ± 5.2 [5]
Burningham et al., 2010 5–15 16–49 [3]
Scholz, 2010 7.9 ± 1.7 25.8 ± 5.5 [4]
Burgasser et al., 2010 10.6+3.0
−2.8
34.6+9.8
−9.1
[8]
Cushing et al., 2010 9.7 ± 0.1[note 3] 31.6 ± 0.3[note 3] [7]
The Hawaii Infrared Parallax Program
(Dupuy & Liu, 2012)
109.9 ± 1.8 9.10 ± 0.15 29.7 ± 0.5 [6]

Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.

Space motion[edit]

SDSS J1416+1348 has proper motion 165 mas·yr−1 with position angle 32 degrees, indicating motion in north-east direction on the sky. Corresponding right ascension and declination components of proper motion are 88.0 ± 2.8 mas/yr and 139.9 ± 1.3 mas/yr, respectively.[5] At distance 29.7 ly (assuming parallax 109.0 ± 1.8 mas),[6] corresponding tangential velocity is 7.1 km/s. Radial velocity of SDSS J1416+1348 is -42.2 ± 5.1 km/s.[5] (Negative radial velocity value indicates that SDSS J1416+1348 is now approaching to us). Total velocity of SDSS J1416+1348 relatively to Solar system is 42.8 km/s.

SDSS J1416+1348 space motions estimates

Source μ,
mas/yr
P. A.,
°
μRA,
mas/yr
μDEC,
mas/yr
Vtan,
km/s[note 4]
Vr,
km/s
Ref.
Bowler et al., 2009 151 ± 8 33 ± 4 82 127 6.5 –38 ± 10 [1]
Schmidt et al., 2009 165 32 88.0 ± 2.8 139.9 ± 1.3 7.1 -42.2 ± 5.1 [5]
Scholz, 2010 163 32 86.2 ± 2.6 138.8 ± 2.6 7.1 [4]
SIMBAD 165 32 88 ± 3 140 ± 2 7.1 -87 ± 33 [10]
Dupuy & Liu, 2012 161.3 ± 2.8 36.1 ± 1.2 95.1 ± 3.0 130.3 ± 3.0 7.1 [6]

The most accurate estimates are marked in bold.

Space motion of SDSS J1416+1348 indicates that it is member of Galactic thin disk population.[1][4][5]

Solar encounter[edit]

Since SDSS J1416+1348 moves much faster in radial direction than in tangential direction, and radial velocity is negative, this brown dwarf system should pass Solar system in future at much smaller distance, than today's distance. Proper motion and radial velocity values from Schmidt et al., 2009 and parallax from Dupuy & Liu, 2012, assuming motion with constant velocity along straight line, yield minimal distance 4.9 ly circa year 207100.

Solar encounter chronology, assuming motion with constant velocity in a straight line relatively Solar system:[note 5]

Date Distance,
ly
Constellation Note
759300 BC 137.96 Virgo/Boötes transition to constellation Boötes
493000 BC 100 Boötes approach to a distance of 100 ly
141600 BC 50 Boötes approach to a distance of 50 ly
300 BC 30 Boötes approach to a distance of 30 ly
2000 29.68 Boötes near present time
71300 20 Boötes approach to a distance of 20 ly
107900 15 Boötes approach to a distance of 15 ly
146200 10 Boötes approach to a distance of 10 ly
162900 8.01 Boötes/Corona Borealis transition to constellation Corona Borealis
168000 7.46 Corona Borealis/Boötes transition to constellation Boötes
170600 7.18 Boötes/Hercules transition to constellation Hercules
186500 5.76 Hercules/Draco transition to constellation Draco
202000 5 Draco approach to a distance of 5 ly
203600 4.97 Draco/Cygnus transition to constellation Cygnus
207100 4.95 Cygnus minimal distance
207600 4.95 Cygnus/Cepheus transition to constellation Cepheus
212200 5 Cepheus removal to a distance of 5 ly
212800 5.01 Cepheus/Cygnus transition to constellation Cygnus
215300 5.08 Cygnus /Cepheus transition to constellation Cepheus
215600 5.09 Cepheus/Lacerta transition to constellation Lacerta
222500 5.41 Lacerta/Andromeda transition to constellation Andromeda
262300 9.3 Andromeda/Pisces transition to constellation Pisces
268000 10 Pisces removal to a distance of 10 ly
306400 15 Pisces removal to a distance of 15 ly
343000 20 Pisces removal to a distance of 20 ly
410500 29.44 Pisces/Cetus transition to constellation Cetus
414500 30 Cetus removal to a distance of 30 ly
507000 43.07 Cetus transition to southern hemisphere
555900 50 Cetus removal to a distance of 50 ly
907200 100 Cetus removal to a distance of 100 ly

System's properties[edit]

SDSS J1416+1348 is an old system (age estimates: >0.8 Gyr,[5] ~10 Gyr,[3] ~5 Gyr,[4] 2–10 Gyr,[8] >3.2 Gyr[7]), and, probably, possesses low metallicity.[3] Its two components are separated at angular distance 9.81 arcsec, corresponding to a projected separation 89.3 ± 1.5 a. u.[6] The system's orbit semi-major axis estimate is 104+28
−72
a. u.[6]

Component A[edit]

The primary (brighter) component (SDSS J141624.08+134826.7 is mainly its designation; also known as SDSS J1416+13A) is a brown dwarf of spectral type sdL7,[2] or L6,[1][4][6] or L5,[5] or d/sdL7.[3] It has unusually blue near-infrared J−KS color.[3][4][5][8] According Cushing et al. 2010, its peculiar spectrum is primarily a result of thin condensate clouds, and also vertical mixing occurs in its atmosphere.[7] However, in Burgasser et al., 2010 it was suggested that its (as well as component's B) peculiarities arise from age or metallicity, rather than cloud properties alone (since both A and B components have common peculiarities).[8]

Component B[edit]

The secondary (fainter) component (ULAS J141623.94+134836.3, abbreviated to ULAS J1416+1348, also known as SDSS J1416+13B) is a brown dwarf of spectral type T7.5,[8][13][14] or T7.5p.[3][6] It has unusually extremely blue near-infrared color H−K,[3] very red optical-to-near-infrared color (z−Y > +2.3 and z−J > +3.1),[4] and extremely red color H−[4.5] = 4.86 ± 0.04[3] (it was suggested, that the latter may be explained by presence of a cooler unresolved companion to SDSS J1416+13B).[3] Also, its spectrum indicates high surface gravity and/or subsolar metallicity.[8]

Notes[edit]

  1. ^ Date of arXiv preprint. The articles was published in journals in early 2010.
  2. ^ Relative parallax.
  3. ^ a b The error does not include any errors in temperature and surface gravity and therefore is actually larger.
  4. ^ Assuming parallax 109.9 ± 1.8 mas.
  5. ^ Actually, galactic orbits may be considered as approximately straight lines only on a scale much smaller than theirs sizes.

References[edit]

  1. ^ a b c d e f g h i j k l m n o p q Bowler, Brendan P.; Liu, Michael C.; Dupuy, Trent J. (2010). "SDSS J141624.08+134826.7: A Nearby Blue L Dwarf From the Sloan Digital Sky Survey". The Astrophysical Journal 710 (1): 45–50. arXiv:0912.3796. Bibcode:2010ApJ...710...45B. doi:10.1088/0004-637X/710/1/45. 
  2. ^ a b c Kirkpatrick, J. Davy; Looper, Dagny L.; Burgasser, Adam J.; Schurr, Steven D.; Cutri, Roc M.; Cushing, Michael C.; Cruz, Kelle L.; Sweet, Anne C.; Knapp, Gillian R.; Barman, Travis S.; Bochanski, John J.; Roellig, Thomas L.; McLean, Ian S.; McGovern, Mark R.; Rice, Emily L. (2010). "Discoveries from a Near-infrared Proper Motion Survey Using Multi-epoch Two Micron All-Sky Survey Data". The Astrophysical Journal Supplement 190 (1): 100–146. arXiv:1008.3591. Bibcode:2010ApJS..190..100K. doi:10.1088/0067-0049/190/1/100. 
  3. ^ a b c d e f g h i j k l m n o p q r s t u v w x y Burningham, Ben; Leggett, S. K.; Lucas, P. W.; Pinfield, D. J.; Smart, R. L.; Day-Jones, A. C.; Jones, H. R. A.; Murray, D.; Nickson, E.; Tamura, M.; Zhang, Z.; Lodieu, N.; Tinney, C. G.; Zapatero Osorio, M. R. (2010). "The discovery of a very cool binary system". Monthly Notices of the Royal Astronomical Society 404 (4): 1952–1961. arXiv:1001.4393. Bibcode:2010MNRAS.404.1952B. doi:10.1111/j.1365-2966.2010.16411.x. 
  4. ^ a b c d e f g h i j k l m n o p q r Scholz, R.-D. (2010). "ULAS J141623.94+134836.3 - a faint common proper motion companion of a nearby L dwarf. Serendipitous discovery of a cool brown dwarf in UKIDSS DR6". Astronomy and Astrophysics 510: L8. arXiv:1001.2743. Bibcode:2010A&A...510L...8S. doi:10.1051/0004-6361/201014078. 
  5. ^ a b c d e f g h i j k l m n Schmidt, Sarah J.; West, Andrew A.; Burgasser, Adam J.; Bochanski, John J.; Hawley, Suzanne L. (2010). "Discovery of an Unusually Blue L Dwarf Within 10 pc of the Sun". The Astronomical Journal 139 (3): 1045–1050. arXiv:0912.3565. Bibcode:2010AJ....139.1045S. doi:10.1088/0004-6256/139/3/1045. 
  6. ^ a b c d e f g h i j k l Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". arXiv:1201.2465v1 [astro-ph.SR]. Bibcode 2012arXiv1201.2465D.
  7. ^ a b c d e f g Cushing, Michael C.; Saumon, D.; Marley, Mark S. (2010). "SDSS J141624.08+134826.7: Blue L dwarfs and Non-equilibrium Chemistry". The Astronomical Journal 140 (5): 1428–1432. arXiv:1009.2802. Bibcode:2010AJ....140.1428C. doi:10.1088/0004-6256/140/5/1428. 
  8. ^ a b c d e f g h i j k l m Burgasser, Adam J.; Looper, Dagny; Rayner, John T. (2010). "ULAS J141623.94+134836.3: A Blue T Dwarf Companion to a Blue L Dwarf". The Astronomical Journal 139 (6): 2448–2454. arXiv:1002.0645. Bibcode:2010AJ....139.2448B. doi:10.1088/0004-6256/139/6/2448. 
  9. ^ a b Schneider, Jean. "Star : SDSS 141624". Extrasolar Planets Encyclopaedia. CNRS/LUTH - Paris Observatory. Retrieved 2012-05-19. 
  10. ^ a b c d "2MASS J14162408+1348263 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-05-19. 
  11. ^ a b c "ULAS J141623.94+134836.3 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-05-19. 
  12. ^ Burgasser, Adam J.; Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Griffith, Roger L.; Looper, Dagny L.; Tinney, Christopher; Simcoe, Robert A.; Bochanski, John J.; Skrutskie, Michael F.; Mainzer, A.; Thompson, Maggie A.; Marsh, Kenneth A.; Bauer, James M.; Wright, Edward L. (2011). "Fire Spectroscopy of Five Late-type T Dwarfs Discovered with the Wide-field Infrared Survey Explorer". The Astrophysical Journal 735 (2): 116. arXiv:1104.2537. Bibcode:2011ApJ...735..116B. doi:10.1088/0004-637X/735/2/116. 
  13. ^ a b Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Mace, Gregory N.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Eisenhardt, Peter R.; McLean, Ian S.; Mainzer, Amanda K.; Burgasser, Adam J.; Tinney, C. G.; Parker, Stephen; Salter, Graeme (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". arXiv:1205.2122v1 [astro-ph.SR]. Bibcode 2012arXiv1205.2122K.
  14. ^ Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Mainzer, A.; Eisenhardt, Peter R.; McLean, Ian S.; Thompson, Maggie A.; Bauer, James M.; Benford, Dominic J.; Bridge, Carrie R.; Lake, Sean E.; Petty, Sara M.; Stanford, S. A.; Tsai, Chao-Wei; Bailey, Vanessa; Beichman, Charles A.; Bloom, Joshua S.; Bochanski, John J.; Burgasser, Adam J.; Capak, Peter L.; Cruz, Kelle L.; Hinz, Philip M.; Kartaltepe, Jeyhan S.; Knox, Russell P.; Manohar, Swarnima; Masters, Daniel; Morales-Calderón, Maria; Prato, Lisa A.; Rodigas, Timothy J.; Salvato, Mara; Schurr, Steven D.; Scoville, Nicholas Z.; Simcoe, Robert A.; Stapelfeldt, Karl R.; Stern, Daniel; Stock, Nathan D.; Vacca, William D. (2011). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". The Astrophysical Journal Supplement 197 (2): 19. arXiv:1108.4677v1. Bibcode:2011ApJS..197...19K. doi:10.1088/0067-0049/197/2/19.