Results 1 to 3 of 3
Like Tree12Likes
  • 8 Post By not_Fritz_Argelander
  • 1 Post By sketrip
  • 3 Post By not_Fritz_Argelander

Thread: Earth not an ocean-world because of massive star in formation neighborhood

  1. #1
    not_Fritz_Argelander's Avatar
    not_Fritz_Argelander is offline HYPER GIANT
    Points: 177,076, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.7%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!750 Days+ Registered Achievement!First 1000 Experience Points
    Awards:
    Thread Award
    Join Date
    Jul 2011
    Location
    US
    Posts
    21,590
    Points
    177,076
    Level
    100
    Thanks
    7,214
    Thanked 45,673x 14,692 Posts
    Blog Entries
    59

    Default Earth not an ocean-world because of massive star in formation neighborhood



    Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG

  2. The Following 8 Users Say Thank You to not_Fritz_Argelander For This Useful Post:

    bladekeeper (02-13-2019),chas53 (02-12-2019),Gabby76 (02-12-2019),helicon64 (02-11-2019),ic_1101 (02-19-2019),Mag95On (02-11-2019),michael131313 (02-12-2019),sketrip (02-12-2019)

  3. #2
    sketrip's Avatar
    sketrip is offline ΜOΛΩΝ ΛΑΒΕ
    Points: 26,196, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 39.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!Gallery Achievement!
    Join Date
    Apr 2015
    Location
    NE Kansas
    Posts
    2,849
    Points
    26,196
    Level
    100
    Thanks
    2,491
    Thanked 1,199x 850 Posts

    Default Re: Earth not an ocean-world because of massive star in formation neighborhood

    Another "Rare Earth" Argument?
    AD10, SV102T, AR127 & ST80 M2 & SW AZEQ6 GT Mounts ES82 11 18 24, ES100 5.5 9 14 20, KK Orthos, BCO 6, 10mm, Vixen HR 2.4, 3.4 Vortex 10X50, ACD 75 Astro Mutt
    "A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Robert A. Heinlein


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  4. The Following User Says Thank You to sketrip For This Useful Post:

    chas53 (02-12-2019)

  5. #3
    not_Fritz_Argelander's Avatar
    not_Fritz_Argelander is offline HYPER GIANT
    Points: 177,076, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.7%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!750 Days+ Registered Achievement!First 1000 Experience Points
    Awards:
    Thread Award
    Join Date
    Jul 2011
    Location
    US
    Posts
    21,590
    Points
    177,076
    Level
    100
    Thanks
    7,214
    Thanked 45,673x 14,692 Posts
    Blog Entries
    59

    Default Re: Earth not an ocean-world because of massive star in formation neighborhood

    Quote Originally Posted by sketrip View Post
    Another "Rare Earth" Argument?
    I wish I knew..... but in the absence of knowledge let's consider the older result:

    https://arxiv.org/abs/0901.3364

    In agreement with previous work, we show that the presence of the short-lived radionuclide Al-26 in the early Solar System was unlikely (<2% a priori probability) to be the result of direct introduction of supernova ejecta into the gaseous disk during the Class II stage of protosolar evolution. We also show that any Bondi-Hoyle accretion of contaminated residual gas from the natal star cluster made a negligible contribution to the primordial Al-26 inventory of the Solar System. These results are consistent with the absence of the oxygen isotopic signature expected with any late introduction of supernova ejecta into the protoplanetary disk. Instead, the presence of Al-26 in the oldest Solar System solids (calcium-aluminum-rich inclusions or CAIs) and its apparent uniform distribution with the inferred canonical Al-26/Al-27 ratio of (4.5-5)E-5 support the inheritance of Al-26 from the parent giant molecular cloud. We propose that this radionuclide originated in a prior generation of massive stars that formed in the same host molecular cloud as the Sun and contaminated that cloud by Wolf-Rayet winds. We calculated the Galactic distribution of Al-26/Al-27 ratios that arise from such contamination using the established embedded cluster mass and stellar initial mass functions, published nucleosynthetic yields from the winds of massive stars, and by assuming rapid and uniform mixing into the cloud. Although our model predicts that the majority of stellar systems contain no Al-26 from massive stars, and that the a priori probability that the Al-26/Al-27 ratio will reach or exceed the canonical Solar System value is only ~6%, the maximum in the distribution of non-zero values is close to the canonical ratio.
    So although there is only a 2% chance of getting the Al-26 from a SN event, it's likely a near certainty that contamination by winds from Wolf-Rayet stars would happen. So water worlds might be the rarity after all.
    pikaia, sketrip and michael131313 like this.
    Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG

  6. The Following 3 Users Say Thank You to not_Fritz_Argelander For This Useful Post:

    chas53 (02-12-2019),michael131313 (02-12-2019),sketrip (02-12-2019)

 

 

Similar Threads

  1. the search for massive compact galaxies (relics of galaxy formation)
    By not_Fritz_Argelander in forum Astrophysics Forum
    Replies: 3
    Last Post: 11-28-2018, 07:20 PM
  2. massive star formation
    By not_Fritz_Argelander in forum Astrophysics Forum
    Replies: 1
    Last Post: 07-25-2018, 06:28 PM
  3. SOFIA focuses on massive star formation
    By not_Fritz_Argelander in forum Astrophysics Forum
    Replies: 0
    Last Post: 01-11-2018, 02:29 PM
  4. Super massive black hole formation - mechanism?
    By kanadalainen in forum Astrophysics Forum
    Replies: 9
    Last Post: 09-29-2017, 08:46 PM
  5. NASA Image of the Day Illustration of Cassini Spacecraft Diving Through Plume of 'Ocean World' Enceladus
    By LightBucket in forum Astronomy News Forum
    Replies: 0
    Last Post: 04-13-2017, 06:10 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 10:36 AM.