Extrasolar, Stars and Exoplanets for Celestia

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LukeCEL
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Post #81by LukeCEL » 13.07.2020, 01:21

ZTF J2055+4651, only the second known binary consisting of a hot OB subdwarf and a white dwarf. Parameters from Kupfer et al. (2020).

Code: Select all

Barycenter "ZTF J2055+4651"
{
   RA 313.81658333
   Dec 46.85179444
   Distance 7502 # 2.3 kpc
}

"ZTF J2055+4651 A"
{
   OrbitBarycenter "ZTF J2055+4651"
   SpectralType "sdO"
   AbsMag 4.37 # estimate from temperature and radius
   Radius 118269
   Temperature 33700

   EllipticalOrbit {
      Period          0.000107133
      SemiMajorAxis   0.0014506 # mass ratio 0.41:0.68
      Inclination     79.97     # inclination to plane of sky:
      AscendingNode   308.45    # 83.4 deg
      ArgOfPericenter 0
   }

   UniformRotation {
      Period          0.93913083 # assuming tidal locking
      Inclination     79.97
      AscendingNode   308.45
   }
}

"ZTF J2055+4651 B"
{
   OrbitBarycenter "ZTF J2055+4651"
   SpectralType "D1" # from T = 63 kK
   AbsMag 8.88 # estimate from temperature and radius
   Radius 10297
   Temperature 63000

   EllipticalOrbit {
      Period          0.000107133
      SemiMajorAxis   0.0008746 # mass ratio 0.41:0.68
      Inclination     79.97     # inclination to plane of sky:
      AscendingNode   308.45    # 83.4 deg
      ArgOfPericenter 180
   }

   UniformRotation {
      Period          0.93913083 # assuming tidal locking
      Inclination     79.97
      AscendingNode   308.45
   }
}

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jujuapapa
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Post #82by jujuapapa » 14.07.2020, 04:57

LukeCEL wrote:ZTF J2055+4651, only the second known binary consisting of a hot OB subdwarf and a white dwarf. Parameters from Kupfer et al. (2020).

Code: Select all

Barycenter "ZTF J2055+4651"
{
   RA 313.81658333
   Dec 46.85179444
   Distance 7502 # 2.3 kpc
}

"ZTF J2055+4651 A"
{
   OrbitBarycenter "ZTF J2055+4651"
   SpectralType "sdO"
   AbsMag 4.37 # estimate from temperature and radius
   Radius 118269
   Temperature 33700

   EllipticalOrbit {
      Period          0.000107133
      SemiMajorAxis   0.0014506 # mass ratio 0.41:0.68
      Inclination     79.97     # inclination to plane of sky:
      AscendingNode   308.45    # 83.4 deg
      ArgOfPericenter 0
   }

   UniformRotation {
      Period          0.93913083 # assuming tidal locking
      Inclination     79.97
      AscendingNode   308.45
   }
}

"ZTF J2055+4651 B"
{
   OrbitBarycenter "ZTF J2055+4651"
   SpectralType "D1" # from T = 63 kK
   AbsMag 8.88 # estimate from temperature and radius
   Radius 10297
   Temperature 63000

   EllipticalOrbit {
      Period          0.000107133
      SemiMajorAxis   0.0008746 # mass ratio 0.41:0.68
      Inclination     79.97     # inclination to plane of sky:
      AscendingNode   308.45    # 83.4 deg
      ArgOfPericenter 180
   }

   UniformRotation {
      Period          0.93913083 # assuming tidal locking
      Inclination     79.97
      AscendingNode   308.45
   }
}

Writed and tested.

This works fine... :wink:
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LukeCEL
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Post #83by LukeCEL » 21.07.2020, 01:36

Here is KIC 12268220, an eclipsing binary. It looks a bit unusual, because the secondary star has a very low mass (about 0.23 Msol) while being quite large (over 3 Rsol). The paper mentioned several other similar systems, apparently the prototype is R CMa. Parameters from Cui et al. (2020).

Code: Select all

Barycenter 1005723569 "KOI-7518:KIC 12268220"
{
   RA 296.49067287
   Dec 50.90586057
   Distance 4372.121
}

"KOI-7518 A:KIC 12268220 A"
{
   OrbitBarycenter "KOI-7518"
   SpectralType "A7IV" # from temperature
   AbsMag 1.00 # from temperature and radius
   Radius 2247111

   EllipticalOrbit {
      Period          0.012105626
      SemiMajorAxis   0.0071307 # mass ratio 1.99:0.23
      Eccentricity    0
      Inclination     99.65
      AscendingNode   288.20
      ArgOfPericenter 162.15
   }

   UniformRotation {
      Period          106.11792 # assuming tidal locking
      Inclination     99.65
      AscendingNode   288.2
   }
}

"KOI-7518 B:KIC 12268220 B"
{
   OrbitBarycenter "KOI-7518"
   SpectralType "K4IV" # from temperature; low-mass and evolved
   AbsMag 3.74 # from temperature and radius
   Radius 2205370
   SemiAxes [ 1 0.95 1 ] # estimate

   EllipticalOrbit {
      Period          0.01210563
      SemiMajorAxis   0.0616962 # mass ratio 1.99:0.23
      Eccentricity    0
      Inclination     99.65
      AscendingNode   288.20
      ArgOfPericenter 342.15
   }

   UniformRotation {
      Period          106.11792 # assuming tidal locking
      Inclination     99.65
      AscendingNode   288.2
   }
}

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Trolligi 112477
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Post #84by Trolligi 112477 » 21.07.2020, 09:39

Weird, but very interesting. :smile:
Question: How can an orange subgiant have such a low mass? I would expect it to have a mass of between 0.6 and 2 MSol. How did it lose so much mass? :think:
Welp, we did it bois. We found life outside of the Earth.



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LukeCEL
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Post #85by LukeCEL » 21.07.2020, 15:47

Trolligi 112477 wrote:Question: How can an orange subgiant have such a low mass? I would expect it to have a mass of between 0.6 and 2 MSol. How did it lose so much mass?

Even though the secondary star has the appropriate temperature and radius, I wouldn't really call it a "subgiant"; that's mainly for Celestia. From what I can tell in the paper, the secondary star was originally the higher-mass star, but evolved quicker and transferred its mass to the primary star. In the future, it might evolve into a EL CVn binary, which is an A- or F-type star orbiting a helium white dwarf.

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Trolligi 112477
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Post #86by Trolligi 112477 » 23.07.2020, 09:57

Ahh okay.
Welp, we did it bois. We found life outside of the Earth.



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LukeCEL
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Post #87by LukeCEL » 18.08.2020, 01:15

Here's a very low-mass eclipsing binary. NGTS J0930-18 has an M0V star and a companion just above the hydrogen-burning limit. Parameters from Acton et al. (2020).

Code: Select all

Barycenter "NGTS J0930-18"
{
   RA 142.56666667
   Dec -18.84267222
   Distance 742.614
}

"NGTS J0930-18 A"
{
   OrbitBarycenter "NGTS J0930-18"
   SpectralType "M0V"
   AppMag 15.529
   Radius 406145

   EllipticalOrbit {
      Period          0.003648586
      SemiMajorAxis   0.0027074 # mass ratio M2/M1 = 0.1059
      Inclination     108.37
      AscendingNode   140.09
      ArgOfPericenter 56.37
      MeanAnomaly     270
      Epoch           2457679.29957
   }

   UniformRotation {
      Inclination     108.37
      AscendingNode   140.09
   }
}

"NGTS J0930-18 B"
{
   OrbitBarycenter "NGTS J0930-18"
   SpectralType "M8.5V" # estimate from mass, radius
   AbsMag 19.14 # estimate from mass, radius
   Radius 73675

   EllipticalOrbit {
      Period          0.003648586
      SemiMajorAxis   0.0192426 # mass ratio M2/M1 = 0.1059
      Inclination     108.37
      AscendingNode   140.09
      ArgOfPericenter 236.37
      MeanAnomaly     270
      Epoch           2457679.29957
   }

   UniformRotation {
      Inclination     108.37
      AscendingNode   140.09
   }
}

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LukeCEL
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Post #88by LukeCEL » 09.09.2020, 02:39

Here's a recently-discovered triple star system. TIC 278825952 consists of three stars, two of which are similar and on a tight, nearly circular orbit, and the third, which is on an unusually circular orbit around the two. Parameters from Mitnyan et al. (2020).

Code: Select all

Barycenter "TIC 278825952"
{
   RA 100.47064
   Dec 55.79494
   Distance 1830 # 561 ± 8 pc
}

Barycenter "TIC 278825952 AB"
{
   OrbitBarycenter "TIC 278825952"

   EllipticalOrbit {
      Period          0.6449005
      SemiMajorAxis   0.2703646 # mass ratio (1.119:1.094):0.746
      Eccentricity    0.00271
      Inclination     93.78
      AscendingNode   99.41
      ArgOfPericenter 86.69
      Epoch           2458401.5712 # inferior conjunction
      MeanAnomaly     306.25
   }
}

"TIC 278825952 A"
{
   OrbitBarycenter "TIC 278825952 AB"
   SpectralType "F7V" # estimate from parameters
   AbsMag 3.71
   Radius 976067

   EllipticalOrbit {
      Period          0.013089728
      SemiMajorAxis   0.0357949 # mass ratio 1.119:1.094
      Eccentricity    0.00027
      Inclination     94.18
      AscendingNode   99.56
      ArgOfPericenter 273.7
      Epoch           2458328.94778 # inferior conjunction
      MeanAnomaly     118.97
   }
}

"TIC 278825952 B"
{
   OrbitBarycenter "TIC 278825952 AB"
   SpectralType "F7V" # estimate from parameters
   AbsMag 3.90
   Radius 908584

   EllipticalOrbit {
      Period          0.013089728
      SemiMajorAxis   0.0366129 # mass ratio 1.119:1.094
      Eccentricity    0.00027
      Inclination     94.18
      AscendingNode   99.56
      ArgOfPericenter 93.7
      Epoch           2458328.94778 # inferior conjunction
      MeanAnomaly     118.97
   }
}

"TIC 278825952 C"
{
   OrbitBarycenter "TIC 278825952"
   SpectralType "K3V"
   AbsMag 6.61
   Radius 483510

   EllipticalOrbit {
      Period          0.6449005
      SemiMajorAxis   0.8020332 # mass ratio (1.119:1.094):0.746
      Eccentricity    0.00271
      Inclination     93.78
      AscendingNode   99.41
      ArgOfPericenter 266.69
      Epoch           2458401.5712 # inferior conjunction
      MeanAnomaly     306.25
   }
}


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